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Spinal Cord

Spinal Cord. Medical Neuroscience Dr. Wiegand. Directions. dorsal. rostral. ventral. caudal. Terms. rostral - toward the “beak” caudal - toward the “tail” ventral - toward the front (anterior) dorsal - toward the back (posterior) superior - above inferior - below. Ascending tracts.

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Spinal Cord

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  1. Spinal Cord Medical Neuroscience Dr. Wiegand

  2. Directions dorsal rostral ventral caudal

  3. Terms • rostral - toward the “beak” • caudal - toward the “tail” • ventral - toward the front (anterior) • dorsal - toward the back (posterior) • superior - above • inferior - below

  4. Ascending tracts Descending tracts Cell bodies Peripheralnervefibers Spinal Cord • Central gray nuclei and outer white matter (tracts)

  5. PNS sensory motor CNS Peripheral and Central Nervous System Lesions

  6. Spinal nerves & cord • 31 pairs with anterior and posterior root • C1 often doesn’t have posterior root • Spinal cord enlarged in C5 – T1 and L2 – S3 levels • Spinal cord ends at L1 vertebral level

  7. Dermatomes & Myotomes • Dermatome – an area of skin innervated by a single posterior root • Myotome – a group of muscles innervated by a single anterior root

  8. C4 T4 T10 L3 L5 Myotomes Dermatomes

  9. Stretch Reflexes • Examples: • C5-6 = biceps tendon • C6 = brachioradialis • C7-8 = triceps tendon • L2-4 = patellar tendon • S1-2 = Achilles tendon

  10. Conus medullaris Filum terminale Cauda equina Dura mater External Spinal Cord

  11. Posterior Median Sulcus Posterior IntermediateSulci Lateral sulci Anterior Median Fissure External Structure – Spinal Cord

  12. Posterior Funiculi Lateral Anterior Internal Structure – White Matter

  13. Posterior Columns Lateral & Anterior Spinothalamic Tracts f. gracilis f. cuneatus Posterior & Anterior Spinocerebellar Tracts White Matter Organization:Ascending Pathways

  14. Lateral Corticospinal Tract Rubrospinal Tract Reticulospinal Tracts Anterior Corticospinal Tract VestibulospinalTracts White Matter Organization:Descending Pathways

  15. Lissauer’sTract Intersegmental Tracts White Matter Organization:Intersegmental Pathways

  16. Posterior Columns Lateral & Anterior Spinothalamic Tracts L T A N L N White Matter Organization:Ascending Pathways

  17. White Matter Organization:Descending Pathways Legs T A Neck

  18. Posterior Motor Groups Intermediate Anterior Lateral Medial Grey Matter Organization

  19. Grey Matter Organization:Anterior Cell Columns

  20. AKA Intermediolateral Cell Column Grey Matter Organization:Lateral Grey Horns: T1 – L2/3

  21. Dorsomarginal nucleus Substantia gelatinosa Nucleus proprius Nucleus dorsalis (Clarke’s column) Grey Matter Organization:Posterior Cell Column

  22. From Pritchard & Alloway: Fig. 3-7

  23. http://lansing.bellarmine.edu/pt/atlas/cover.html

  24. Dorsomarginal n. Substantia gelatinosa Nucleus proprius Nucleus dorsalis (Clarke’s column) Motor nuclei Rexed Lamina

  25. Brown-Sequard Syndrome

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