![]() ![]() The dermatomes on the trunk are layered horizontally, one on top of the other. The remaining spinal nerves all exit below their respective vertebrae. Cervical nerve C8 exits between the C7 vertebra and the T1 vertebra. The cervical nerves C1-C7 exit through the intervertebral foramina above their respective vertebrae. These 31 spinal nerves are composed of 8 pairs of cervical nerves, 12 pairs of thoracic nerves, five pairs of lumbar nerves, five pairs of sacral nerves, and one pair of coccygeal nerve. ![]() In total, there are 31 distinct spinal segments and thus 31 distinct spinal nerves bilaterally. The spinal nerves exit through the intervertebral foramina or neuroforamina and travel along their respective dermatomal distributions from posterior to anterior, creating the specific, observable dermatomal patterns. Spinal nerves form from the dorsal nerve roots and the ventral nerve roots which branch from the dorsal and ventral horn of the spinal cord, respectively. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |