Intro to spinal nerves and dermatomes
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parts of a peripheral nerve, starting at the spinal chord and moving laterally
- anterior and posterior rootlets
- anterior and posterior root
- join together into a spinal nerve
- splits into anterior and posterior ramus
- spinal nerve also splits into recurrant meningeal nerve
root ganglions are found in the
posterior root but not the anterior root
root ganglions are
a collection of nerve cell bodies within the posterior root
anterior rootlets carry
posterior rootlets carry
spinal nerves carry
mixed sensory and motor information
spinal nerves, moving laterally, split into
posterior ramus and anterior ramus and meningeal nerve
posterior rami innervate (supply sensation to and stimulate)
deep muscles and skin of the dorsal surface of the trunk (your back)
anterior rami innervate (supply sensation to and stimulate)
- only thoracic nerves (intercostal) innervate directly. (ha! trick question!)
- Cervical and abdominal nerves split into plexuses (lit. braid or network) a system of axons combined from adjacent nerves.
anterior rami, moving laterally, become
either intercostal nerves (T2-T12) or plexuses (all other)
the recurrant meningeal nerve sinnervate (supply sensation to and stimulate)
the spinal chord itself
after splitting off from the spinal nerve, the meningeal nerve then
re-enters the spinal column through the intervertebral foramen
rootlets leave the spinal column through
an area of skin that is supplied by a single spinal nerve
Dermatomes are innervated
segmentally from vertex to toes. Nerves exiting at specific levels innervate the skin in that vicinity
How many cervical nerves are there? How many cervical vertebrae are there?
8 cervical nerves. 7 cervical vertebrae.
Does a peripheral nerve only ever touch a single dermatome?
No. Peripheral nerves may be composed of several spinal nerves and cross several dermatomes. The dermatomal innervation is determined by the spinal nerve specifically.
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