spinal cord - extends from foramen magnum to the level of the lower border of L1, or upper border of L2
average length is 45 cm
spinal cord surrounded by CSF within the dura. It is suspended laterally by the ligamentum denticulatum.
conus medullaris - this is an expansion at the lower end of the spinal cord.
dorsal roots of the cord convey sensory fibres
ventral roots convey motor fibres
blood supply
upper cord - derived from two anterior spinal arteries (branches of the vertebral arteries). There is fusion of the anterior spinal arteries to form a single vessel
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