spinal cord

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Answer

Nervous system develops from ectoderm

alar plate will become interneurons (connections between motor and sensory neuronos) basal plate will become motor neurons

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31 pairs of spinal nerves

ganglion-outside brain and spinal cord

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CNS tissue is enclosed within the vertebral column from the foramen magnum to L1

cauda equina--collection of nerve roots at the inferior end of the vertebral canal.

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Brachial plexus C4-T1 Lumbar plexus l1-l3 sacral plexus

denticulate ligaments keep roots separate

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Internal structure of spinal cord...canal, white matter, gray matter. Two swellings; cervical enlargement arms/legs and lumbo sacral for leg foot and pelvic viscera.

White matter increases to the brain sa more axoons are added and decreases from the brain.

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Created by: Yoshinao