The cervical spinal nerve 2 (C2) is a spinal nerve of the cervical segment.[1] It is a part of the ansa cervicalis along with the C1 and C3 nerves sometimes forming part of superior root of the ansa cervicalis.[2] it also connects into the inferior root of the ansa cervicalis with the C3.[2]
It originates from the spinal column from above the cervical vertebra 2 (C2).
C2 innervates the rectus capitis anterior and rectus capitis lateralis muscles, and provides sensory nerves to the trapezius and the back of the scalp and upper neck.[2]
At the atlantoaxial joint, the C2 spinal nerve emerges from the spinal cord through a small bony opening known as the intervertebral foramen located above the C2 vertebra. This nerve consists of both sensory and motor components.
The C2 dermatome covers specific regions of the skin that receive sensory input from the C2 nerve. These areas encompass the upper and posterior parts of the scalp, the skin on the front of the neck, and the earlobes. The C2 myotome represents a collection of muscles under the control of the C2 nerve. These muscles are responsible for enabling the forward bending of the neck.
The greater occipital nerve, lesser occipital nerve, greater auricular nerve, and the transverse cervical nerve all emerge from C2, with the latter two shared with the C3.[2]
^American Medical Association Archived 2007-12-20 at the Wayback Machine Nervous System -- Groups of Nerves
^ abcdWaxenbaum, Joshua A.; Reddy, Vamsi; Bordoni, Bruno (2021), "Anatomy, Head and Neck, Cervical Nerves", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 30844163, retrieved 2021-09-22
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