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Chapter 12 CNS part 4

Chapter 12 CNS part 4 - Chapter 12 Central Nervous System...

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Chapter 12 Central Nervous System Part 4 Angela Peterson-Ford, PhD [email protected]
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Spinal Cord CNS tissue is enclosed within the vertebral column from the foramen magnum to L 1 Provides two-way communication to and from the brain Protected by bone, meninges, and CSF Epidural space – space between the vertebrae and the dural sheath (dura mater) filled with fat and a network of veins Epidural space- Is ideal spot for removing CSF and testing (spinal tap or lumbar puncture) because no spinal cord and spinal roots drift away from needle insertion.
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Spinal Cord Figure 12.28a
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Spinal Cord Conus medullaris – terminal portion of the spinal cord Filum terminale – fibrous extension of the pia mater; anchors the spinal cord to the coccyx Denticulate ligaments – delicate shelves of pia mater; attach the spinal cord to the vertebrae
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Spinal Cord Spinal nerves – 31 pairs attach to the cord by paired roots Cervical and lumbar enlargements – sites where nerves serving the upper and lower limbs emerge Cauda equina – collection of nerve roots at the inferior end of the vertebral canal During fetal development, the vertebral column grows faster than the spinal cord, forcing the lower spinal nerve roots to “chase” their exit points inferiorly through the vertebral canal.
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Cross-Sectional Anatomy of the Spinal Cord Anterior median fissure – separates left and right anterior and posterior funiculi Posterior median sulcus – divides spinal cord into right and left halves. Figure 12.30a
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Gray Matter and Spinal Roots Gray matter consists of soma, unmyelinated processes, and neuroglia Gray commissure – connects masses of gray matter; encloses central canal Posterior (dorsal) horns – interneurons Anterior (ventral) horns – interneurons and somatic motor neurons Lateral horns – contain sympathetic nerve fibers
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Gray Matter and Spinal Roots Figure 12.30b
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