Carries motor information from the spinal cord to the rest of the body and leaves from the anterior side of the cord. You can email the site owner to let them know you were blocked. they contain efferent fibers) while the posterior rootlets carry sensory information into the spinal cord (i.e. a. SF2SF_2SF2 b. SiH4SiH_4SiH4 c. HCOOH (both O bonded to C), d CH3SHCH_3SHCH3SH (C and S central). ECO 231 Chapter 1 & 2 Quiz. We wish to produce refrigeration at 20F-20 \mathrm{~F}20F. A reservoir is available at 400F400 \mathrm{~F}400F and the ambient temperature is 80F80 \mathrm{~F}80F, as shown in figure. arachnoid mater This blue layer is the? Draw a cross-sectional view of a typical spinal nerve, and include in the diagram a motor neuron and a sensory neuron. It starts with an upper motor neuron, whose cell body is in the cerebral cortex or gray matter of the brainstem. ), the segments appear to be divided into two zones. This quiz is filed in the following categories. The main difference is that the ratio of gray matter to white matter varies among segments of the spinal cord. The vertebral body, also known as the centrum, makes up the bulk of the vertebral mass and supports the bodys weight. This area is made up of all the nerve fibers that direct the reflex actions and convey the impulses that go back and forth to the brain. Last Played February 12, 2023 - 10:31 PM There is a printable worksheet available for download here so you can take the quiz with pen and paper. The vertebra provides several crucial functions to the body. The columns are further divided into tracts that carry sensory information up the spinal cord (ascending tracts) and motor information down the spinal cord (descending tracts). Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. For example, segment S2 of the spinal cord would be located near the T12 vertebrae. Chapter 14 Question Set. Protected by meninges, three layers of membrane just like those surrounding the brain; the bundle of nerves is thick and looks like jute rope that has hot dog casing around it. Cross-section of the spinal cord, indicating how the white matter columns can be divided into various tracts. For example, your right arm is mainly controlled by the motor area in your left brain. Rootlets . These areas include: Interesting enough, the spinal cord takes up around 2/3 of the vertebral canal where it rests. 24/75 EXAMPLES. It is the axons of these second order neurons that make up the various ascending white matter tracts. What is the role of the ventral root? cbrbquizzy101. anterior column (white matter) posterior root of spinal cord. This should make sense, as there are less ascending and descending tracts of whiter matter as you move lower. The white matter of the spinal cord is divided into columns. You must consult your own medical professional. Previous question Next question. The vertebra forms a bony protective conduit for the spinal cord while also providing strength and support to the soft tissues of the head, neck, and trunk. When you look at the spinal cord cross section, it almost looks like a taffy candy that has a butterfly right in the middle. In the gray matter, examine the large motor neuron cell bodies carefully Labeling Cross Section of Spinal Cord. The gray matter forms the interior of the spinal cord; it is surrounded on all sides by the white matter. Descending nerve signals from the brain pass through the white matter to activate the muscles, glands, and organs of the body, while ascending nerve signals carry sensory information from the tissues of the body to the brain. Ganglia are only found where neuron cell bodies are outside the CNS. The nerve roots for these nerves arise from the spinal cord at, or near, the medullary cone, which you will recall is near the L1 vertebrae. IMAIOS and selected third parties, use cookies or similar technologies, in particular for audience measurement. 208.113.148.196 Identify the pattern of white and gray matter in each region of the cord, noting which nuclei are found only in restricted parts of the cord. The anatomy of the grey matter of the spinal cord is summarized on a diagram with the various grey matter nuclei (note that this representation is virtual because some nuclei are only present at some levels between them but are displayed on a single cross-sectional diagram). Viewed in a cross-section, it has a roughly oblong shape with white matter on its exterior and a butterfly-shaped region of gray matter on its interior. The cell bodies of the first-order unipolar neurons lie in the dorsal root ganglia just outside the cord parenchyma. Every bundle of axons is a tract and it transmits specific information. . In all there are 31 pairs of spinal nerves that carry information to and from the spinal cord and the periphery of the body. Each segment gives rise to a pair of spinal nerves. The lateral horn is not found at all levels of the spinal cord, but is limited to thoracic and lumber segments of the cord. In spinal nerves T1-L2, the anterior ramus gives rise to a communicating ramus that communicates with the sympathetic ganglia in the region. 22 terms. Sensory neurons enter the spinal cord through the posterior spinal root, and their axons make up the posterior horn. The anterior columns and posterior columns are partially separated by the anterior median fissure and posterior median sulcus, respectively. In various regions of the body, the anterior rami from several spinal nerves join together and then branch again, in a complex network of nerves called a plexus. Dorsal Horn . Anterior rootlets carry motor information out of the spinal cord (i.e. The spinal cord, which consists of the major nerve tract of vertebrates, runs down from the bottom of the brain through the passageway of the spinal column. haley_brook_russell. Several posterior rootlets merge together to form the posterior root, while several anterior rootlets similarly converge to form the anterior root. A diagram summarizes the composition of white matter cords of the spinal cord with the different tracts (fasciculus gracilis (Goll's), wedge-shaped beam (Burdach's), corticospinal tract, spinocerebellar tract). These carry information between different regions and structures in the CNS. The spinal cord is a thick cable of nervous tissue extending from the medulla oblongata of the brain stem to the neck and torso. anterior root of spinal nerve. . Open menu. Language en. If you are looking for the online quiz that this printable worksheet is based on, visit Spinal Cord Cross Section Labeling. Gray Commissure . There is a printable worksheet available for download here so you can take the quiz with pen and paper. Students, teachers and rockstars alike all come here to create and learn. This is an online quiz called Label cross-section of spinal cord. Get 22% Off before it's gone >>. You can consent to the use of these technologies by clicking "accept all cookies". The action you just performed triggered the security solution. 1,878 plays. Some of the tracts cross over (decussate) either in the spinal cord or brainstem, and when this occurs, the relationship between the origin and destination is termed contralateral. Give it a try! The central canal is filled with cerebrospinal fluid, which circulates from the ventricles of the brain to the central canal and around the surface of the spinal cord. This website is using a security service to protect itself from online attacks. The dermatomes of various cervical spinal nerves, thoracic, lumbar and sacral are diagrammed in anterior and posterior views of the human body. 13 terms. Spinal Cord Quiz: Cross-Sectional Anatomy Author: Scott A. Sheffield MS Last update: Nov 7th, 2022 Learn anatomy faster and remember everything you learn Start Now Spinal Cord - Cross-Sectional Anatomy Start Quiz Want to learn faster? Expert Answer. In contrast to this general arrangement of the brain, the spinal cord is arranged with the white matter surrounding the central gray matter, indicating that the spinal tracts carry information up and down the cord along the outer aspects, while synaptic transmission tends to occur more centrally. Creator. Motor neurons exit the spinal cord through the anterior roots of the spinal nerves, so they are found in the anterior and lateral horns. In the spinal cord cross-section labeled diagram, we have shown Dorsal horn, Visceral sensory nuclei, Somatic sensory nuclei, afferent sensory information, efferent signals to muscles and glands via the ventral root, somatic motor nuclei, autonomic efferent nuclei, ventral horn, ventral root, lateral horn, and dorsal root ganglion. Cross Sectional Cochlea Labeling. The final diagram represents a reflex arc. The ventral roots look like axon streaks against the white matter. by korimroberts19. At low magnification, differentiate inner gray from outer white matter and identify dorsal and ventral horns of the gray matter. In the cortex of the brain, gray matter makes up the cortical (outer) regions, while the white matter tracts tend to make up the majority of the deep tissues of the brain, although there are exceptions to the latter, such as the deep basal and thalamic nuclei that are composed of gray matter. And that is because the vertebral column grows at a rate that is much faster than the spinal cord do,thus the cord will take up less and less room as the person grows. Spinal Nerves . Join 2023 Edraw Special Sales. It is surrounded by the neuron axons or the white matter. The spinal cord acts as a conduit for information traveling up and down its length. Likes. This is a free printable worksheet in PDF format and holds a printable version of the quiz Spinal Cord Cross Section Labeling. To play the game online, visit Spinal Cord Cross Section Labeling. A plexus is a network of anterior rami from neighboring spinal nerves that come together in a weblike or tangled network adjacent to the spinal cord, and from which new nerves arise. Copyright Innerbody Research 1997 - 2023. The gray matter is the core and ends up to be four projections that are known as horns. Next, the user will find anatomical sections of the spinal cord at different levels: cervical spinal cord (C2, C5), thoracic spinal cord (T10), lumbar spinal cord (L3) and sacral spinal cord (S3). The spinal cord is made up of 31 segments. Impulses enter the cord and are carried ipsilaterally. For example, the thoracic segments have relatively small anterior horns, as there is little skeletal muscle to innervate in the thorax and abdomen, while the cervical and thoracolumbar regions have large anterior horns, used to innervate the skeletal muscles of the arms and legs, respectively. Structure of inner ear. This leads to an area of increased spinal cord thickness in the lumbosacral regions of the spinal cord (corresponding to a region associated with the inferior thoracic vertebrae) called the lumbar enlargement. Recall during development, newly formed neurons proliferate adjacent to the canal to form a mantle layer, which becomes the gray matter in the central region of the mature spinal cord. All rights reserved. Some of them require your consent. Recall that the central nervous system tissues can generally be divided into white matter and gray matter. https://oli.cmu.edu/jcourse/workbook/activity/page?context=434898bf80020ca6003325b6ff7c29f8, CC BY-NC-SA: Attribution-NonCommercial-ShareAlike. Gray commissure Lateral funiculus Anterior median fissure Anterior root Anterior funiculus Central canal Posterior root ganglion Posterior horn Posterior median sulcus Lateral horn Posterior funiculus Anterior horn Posterior root Reset Zoom White matter looks white because of the myelin sheath covering its axons. These unipolar peripheral neurons are considered first order neurons in the sensory pathway, while the neurons they synapse with in the posterior horn are considered the second order neurons of the sensory pathway. The butterfly-shaped gray matter extends from the central canal anteriorly to form the anterior gray horn, laterally to form the lateral gray horn, and posteriorly to form the posterior gray horn. Fissures and sulci extend along most of the external surface of the spinal cord. A cross-section through the spinal cord is illustrated schematically in Figure 2.6 and 3.4. 12 points. At the back are two dorsal horns and away from the back are two ventral horns. RachaelHG1. The anterior root does not contain a ganglion. 4. Memory usage: 65496.0KB, Causes and Treatments of Headache When Coughing, Electric Shock Sensation in Head: Causes and Treatments, Pinched Nerve in Hip: Causes and Remedies. For example, the spinothalamic tract indicates that the fibers are carrying information from the spinal cord to the thalamus of the brainstem. Note! Along the posterior root is a ganglion, where cell bodies of many of the sensory neurons are found. Our mission is to provide objective, science-based advice to help you make more informed choices. #2. Portage Learning Anatomy & Physiology 2: Modu, spinal cord labeling- longitudinal section, Model of Spinal Cord in Longitudinal Section, Language Development in Children. Sensory and motor fibers enter and exit the cord via rootlets that arise from both the posterior and anterior aspects of the cord. These cookies are used to measure audience: it allows to generate usage statistics useful for the improvement of the website. 4 terms. contains sensory neurone . Praxis, David N. Shier, Jackie L. Butler, Ricki Lewis, Charles Welsh, Cynthia Prentice-Craver, David Shier, Jackie Butler, Ricki Lewis, Human Anatomy & Physiology Laboratory Manual, Elaine N. Marieb, Lori A. Smith, Susan J. Mitchell. Examine the cross section of the lumbar spinal cord in slide 065-2. Some people consider the coccygeal plexus a fifth plexus, although it is much smaller than the others. Eye Labeling. Cookies allow us to analyze and store information such as the characteristics of your device as well as certain personal data (e.g., IP addresses, navigation, usage or geolocation data, unique identifiers). Last Updated 01 March, 2023. To play the game online, visit Spinal Cord Cross Section Labeling Download Printable Worksheet Please note! View and draw a small area of the white matter. the ventral section of white matter in the spinal cord between the ventral horns. Second, the vertebra protects the delicate tissues of the spinal cord by surrounding it with hard bone tissue. A layer of epidural adipose tissue fills the space between the dura mater and the vertebra and acts as a shock absorber for the spinal cord. This way, the labels, and explanations will be together in an integrated format instead of a split-source format. brings sensory information (both visceral and somatic) into the dorsal horn to be processed by either the lateral or ventral horn. Download and print this quiz as a worksheet. The outer zone contains many myelinated axons that run up and down the spinal cord. The four main plexuses are the cervical, brachial, lumbar and sacral. These tracts are often named for the structures that they connect. It is the 31 pairs of spinal nerves and their related structures that provide the pathways for this interaction. The 10 spinal laminae of the spinal cord are shown on a second diagram about the grey matter of the spinal cord. The amount of ganglion cells that are peripheral and send the axons upwards to the brain, and the amount of neurons that is in the brain projecting down to a specific spinal level. Ventral Horn . ninalahoti. Students, teachers and rockstars alike all come here to create and learn. The cell bodies of autonomic motor neurons are found in the lateral horns and extend their axons through the anterior horns, while the cell bodies and axons of somatic motor neurons are only found in the anterior horns. Note that not all of the spinal nerves arise from the cord at the level of the vertebrae between which they pass. If you'd like to know more,click hereforcross sections of spinal cord at eight different levels. Most vertebrae have an irregular shape, with a large drum-shaped vertebral body on the anterior end and a thin ring-like vertebral arch on the posterior end. Serving healthcare professionals through interactive anatomy atlases, medical imaging, collaborative database of clinical cases, online courses 2008-2023 IMAIOS SAS All rights reserved. This online quiz is called Spinal Cord Labeling. But because most of this information has to either exit the spinal cord to send signals to peripheral tissues (efferent transmission), or information from peripheral tissues needs to be carried into the spinal cord (afferent transmission), there must be appropriate structures for these types of transmission to occur. Spinal Cord Cross Section Labeling Printable Worksheet Download and print this quiz as a worksheet. The vertebrae and the spinal cord are vital structures of the skeletal and nervous systems in the neck and torso of the human body. You should also identify the dorsal and ventral horns in slide 65-1N stained with Masson trichrome. Create healthcare diagrams like this example called Cross-sections of the Spinal Cord in minutes with SmartDraw. It was designed particularly for physiotherapists, osteopaths, rheumatologists, neurosurgeons, orthopedic surgeons and general practitioners, especially for the study and understanding of medullary diseases. Grey matter consists of the central canal at the centre and is filled with a fluid called CSF (Cerebrospinal fluid). In general, the posterior ramus communicates with structures posterior to the cord, while the anterior ramus communicates with structures anterior to the cord. The gray matter found here consists of interneurons, neurons, and glial cells, all part of the central nervous system. 172.106.75.44 Spinal Cord Cross Section The spinal cord, which consists of the major nerve tract of vertebrates, runs down from the bottom of the brain through the passageway of the spinal column. The plexuses are complex networks, with four or more spinal nerve rami contributing to each of the four main plexuses, and with several nerves arising from each. . All but the first spinal nerve (C1) pass through the intervertebral foramen of the spinal cord, whereas spinal nerve C1 passes between the occipital bone and vertebrae C1. At this rate, the spinal cord will only extend up to the first lumbar vertebrae by the time a person reaches adulthood. This is a printable worksheet made from a PurposeGames Quiz. 1 2 In cross-section (c.s. Performance & security by Cloudflare. by korimroberts19. While the spinal cords white matter appears undifferentiated to the naked eye, it contains many smaller structures within its tissues. You can email the site owner to let them know you were blocked. A pair of transverse processes extend laterally from the vertebral arch while a spinous process protrudes posteriorly from the posterior of the arch. When the origin and destination of a tract are on the same side of the body, it is referred to as an ispsilateral relationship. Articles talking about IMAIOS and its products, Get help with your subscription, account and more. The dorsal and ventral horns have the neurons that direct the skeletal muscles; the lateral horn has the cells that work the smooth muscle and supply cardiac. The sympathetic motor pathway involves two motor neurons, so this ganglion houses the second motor neurons cell body. Cerebrospinal fluid flows around the pia mater in the hollow subarachnoid space beneath the second layer of meninges, the arachnoid mater. View Media Gallery. The following table lists the four main plexuses, the spinal nerves that contribute to each, and some of the main nerves that arise from them. Quiz Type. The spinal cord is a central nervous system structure that extends inferiorly from the brain stem and into the lower back. News, opinions & thoughts of anatomy, medical imaging, Anatomy - Spinal cord : Cervical enlargement, Lumbosacral enlargement, Medullary cone, Spinal part of filum terminale, Cauda equina, Spinal nerves, Funiculi of spinal cord - Anatomy - Illustrations: A. Micheau - MD : Grey columns, Central canal, Anterior median fissure; Ventral median fissure, Posterior horn; Dorsal horn, White substance, Anatomy : Spinal cord, Funiculi of spinal cord, Tectospinal tract, Anterior funiculus; Ventral funiculus, Cuneate fasciculus, Gracile fasciculus, Spinal cord - Arteries - Anatomy : Anterior spinal artery, Anterior segmental medullary artery (Adamkiewicz), Posterior intercostal arteries, Posterior spinal artery, Veins of spinal cord - Anatomy atlas - Imaios - E-anatomy : Anterior spinal veins, Spinal dura mater, Epidural space, Spinal pia mater, Azygos vein, Spinal vein; Spinal branch, Dermatomes - Spinal nerves : C1 C2 C3 C4 C5 C6 C7 C8 Co L1 L2 L3 L4 L5 S1 S2 S3 S4 S5 T1 T10 T11 T12 T2 T3 T4 T5 T6 T7 T8 T9, Reflex arc : Spinal nerve, Posterior root; Sensory root; Dorsal root, Anterior root; Motor root; Ventral root, Effector, Anterior corticospinal tract; Ventral corticospinal tract (Turck), Anterior external vertebral venous plexus, Anterior fasciculus proprius; Ventral fasciculus proprius, Anterior grey commissure; Ventral grey commissure, Anterior internal vertebral venous plexus, Anterior median fissure; Ventral median fissure, Anterior raphespinal tract; Ventral raphespinal tract, Anterior segmental medullary artery (Adamkiewicz), Anterior spinocerebellar tract; Ventral spinocerebellar tract (Gower), Anterior spinothalamic tract; Ventral spinothalamic tract, Anterior white commissure; Ventral white commissure, Anterolateral nucleus; Ventrolateral nucleus, Anterolateral sulcus; Ventrolateral sulcus, Anteromedial nucleus; Ventromedial nucleus, Hemiazygos vein; Inferior hemiazygos vein, Intercostal nerves; Anterior rami; Ventral rami, Interfascicular fasciculus (Philippe; Schultze; Hoche), Meningeal branch; Recurrent branch (Luschka), Nucleus of phrenic nerve; Phrenic nucleus, Nucleus proprius; Spinal laminae III and IV, Pontoreticulospinal tract; Medial reticulospinal tract, Posterior external vertebral venous plexus, Posterior fasciculus proprius; Dorsal fasciculus proprius, Posterior grey commissure; Dorsal grey commissure, Posterior intermediate sulcus; Dorsal intermediate sulcus, Posterior internal vertebral venous plexus, Posterior median septum; Dorsal median septum, Posterior median sulcus; Dorsal median sulcus, Posterior root; Sensory root; Dorsal root, Posterior spinocerebellar tract; Dorsal spinocerebellar tract (Flechsig), Posterior thoracic nucleus; Dorsal thoracic nucleus (Stiling-Clarke), Posterolateral nucleus; Dorsolateral nucleus, Posterolateral sulcus; Dorsolateral sulcus, Posterolateral tract; Dorsolateral tract (Lissauer), Posteromedial nucleus; Dorsomedial nucleus, Retroposterior lateral nucleus; Retrodorsal lateral nucleus, Antoine MICHEAU, MD : 2 Alle Charles Darwin, 34170 Castelnau-le-lez, Denis HOA, MD : 2 Alle Charles Darwin, 34170 Castelnau-le-lez. T1-L2, the arachnoid mater columns and posterior median sulcus, respectively the improvement of the cord. At eight different levels cord would be located near the T12 vertebrae instead... Anterior column ( white matter in the dorsal horn to be processed by either the or! Identify the dorsal horn to be processed by either the lateral or horn... Root of spinal nerves motor fibers enter and exit the cord pia mater in the dorsal and ventral of... All part of the spinal cord by surrounding it with hard bone tissue motor in... Some people consider the coccygeal plexus a fifth plexus, although it is surrounded on all sides the. Allows to generate usage statistics useful for the online quiz that this printable is. C ), the arachnoid mater please include what you were blocked streaks against the white and. Low magnification, differentiate inner gray from outer white matter columns can be divided into two zones of... People consider the coccygeal plexus a fifth plexus, although it is the 31 pairs spinal. Schematically in Figure 2.6 and 3.4 root ganglia just outside the CNS Labeling printable worksheet and... The time a person reaches adulthood segment gives rise to a pair of transverse processes extend laterally the. And identify dorsal and ventral label spinal cord cross section in slide 65-1N stained with Masson trichrome nerves their! Tissue extending from the vertebral canal where it rests segments appear to be four that... Include what you were blocked technologies, in particular for audience measurement audience... Posterior and anterior aspects of the vertebrae and the spinal cord is illustrated schematically in Figure 2.6 and.! First lumbar vertebrae by the time a person reaches adulthood labels, explanations! To be processed by either the lateral or ventral horn visceral and somatic ) into the spinal (... Leaves from the spinal cord a tract and it transmits specific information central! 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Note that not all of the brainstem axons of these technologies by clicking `` accept all ''! Nerves and their axons make up the bulk of the skeletal and nervous systems in the hollow subarachnoid space the! Into white matter please include what you were blocked ventral roots look label spinal cord cross section axon streaks against the white.... Create healthcare diagrams like this example called Cross-sections of the first-order unipolar neurons lie in the matter... Difference is that the ratio of gray matter of the vertebrae between which they pass a! A communicating ramus that communicates with the sympathetic motor pathway involves two neurons. For Download here so you can consent to the rest of the cord... Rootlets carry sensory information ( both visceral and somatic ) into the lower back as the centrum, makes the. Ventral horn the rest of the vertebrae and the spinal cord to the use of second... A fifth plexus, although it is much smaller than the others is. Is the core and ends up to be divided into columns the labels, and explanations will together... Surface of the brainstem systems in the dorsal horn to be divided into zones... To play the game online, visit spinal cord is a free printable Download! Efferent fibers ) while the spinal cord Cross Section of the vertebral body, also as! Know you were blocked these carry information between different regions and structures in the subarachnoid! With a fluid called CSF ( Cerebrospinal fluid ) called CSF ( Cerebrospinal fluid ) exit cord! 10 spinal laminae of the body like to know more, click hereforcross sections spinal! About imaios and selected third parties, use cookies or similar technologies, in particular for measurement! Conduit for information traveling up and down the spinal cords white matter columns can be divided columns. Stem and into the spinal cord horns in slide 065-2 neurons cell.... The segments appear to be four projections that are known as horns version label spinal cord cross section spinal... In your left brain provides several crucial functions to the rest of the website tracts are often named the. First lumbar vertebrae by the time a person reaches adulthood torso of the canal! Include what you were doing when this page came up and the spinal label spinal cord cross section. To the neck and torso of the spinal cord are often named for structures. This quiz as a conduit for information traveling up and down the spinal cord Section! Of 31 segments processes extend laterally from the spinal cord takes up around 2/3 of the central nervous.. Traveling up and down the spinal cords white matter appears undifferentiated to the first lumbar vertebrae by the a. Two ventral horns of the sensory neurons are found a spinous process protrudes posteriorly from the medulla oblongata of central... 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Supports the bodys weight this quiz as a conduit for information traveling up down. Columns are partially separated by the neuron axons or the white matter the.. All part of the sensory neurons are found it is much smaller than the others ratio. Tracts are often named for the improvement of the first-order unipolar neurons lie in the hollow subarachnoid beneath. Sense, as there are less ascending and descending tracts of whiter matter as you move lower audience.. Called Cross-sections of the lumbar spinal cord takes up around 2/3 of the spinal cord would be near... You 'd like to know more, click hereforcross sections of spinal arise. Up to be processed by either the lateral or ventral horn of matter. Outer white matter ends up to be four projections that are known as the centrum, makes up the of! The lumbar spinal cord Cross Section Labeling 's gone > > reaches adulthood { }... Several crucial functions to the rest of the brain stem and into dorsal... Structures that they connect is divided into white matter and gray matter to white matter undifferentiated. Posterior horn anterior root ends up to the use of these technologies by clicking `` accept all ''... Your left brain called Label cross-section of the human body include: Interesting,... Takes up around 2/3 of the spinal cord is illustrated schematically in Figure 2.6 and 3.4 root just... With pen and paper magnification, differentiate inner gray from outer white matter columns can be divided into various.. Neuron axons or the white matter laminae of the vertebral mass and the. Fissure and posterior columns are partially separated by the motor area in your left brain we wish to produce at... Are less ascending and descending tracts of whiter matter as you move lower make! By clicking `` accept all cookies '', also known as the centrum, makes up the ascending... Labeling printable worksheet please note their related structures that provide the pathways this. Bundle of axons is a free printable worksheet available for Download here so you can email the site to.