Neural Control and Coordination for NEET | Part 10 | Spinal Cord - Videos

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Spinal Cord:
The spinal cord starts at the base of the brain, runs throughout the cervical and thoracic spine, and typically ends at the lower part of the thoracic spine.

The spinal cord does not run through the lumbar spine (lower back). After the spinal cord stops in the lower thoracic spine, the nerve roots from the lumbar and sacral levels come off the bottom of the cord like a “horse’s tail” (named the cauda equina) and exit the spine.
Spinal Cord and Nerve Root Anatomy

The spinal cord can be divided into segments according to the nerve roots that branch off of it. Nerves along the cord consists of:

8 cervical nerves
12 thoracic nerves
5 lumbar nerves
5 sacral nerves
1 coccygeal nerve

For most spinal segments, the nerve roots run through the bony canal, and at each level a pair of nerve roots exits from the spine. Cervical spine nerve roots. In the neck, the nerve root is named for the lower segment that it runs between (e.g. C6 nerve root at C5-C6 segment).
Lumbar spine nerve roots. In the lower back, the nerve is named for the upper segment that it runs between (e.g. L4 nerve root at L4-L5 segment).

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