C2 NERVE

 

ORIGIN: Spinal cord segment C2.

COURSE/DISTRIBUTION: This nerve takes origin from spinal cord segment C2 and leaves the vertebral canal by passing between the atlas and axis bone in the intervertebral foramen between the two.

Dorsal ramus:

It merges between the posterior arch of atlas and the lamina of the axis, anterior to the obliquus inferior. It then divides into medial and lateral branches.

Medial branch is called the greater occipital nerve. It runs upwards between the obliquus inferior and semispinalis capitis. It then pierces the latter and supplies it. It supplies the skin of the scalp as far as the vertex.

Ventral ramus:

Runs between the transverse processes of the axis and the alas. It merges between the longus capitis and the levator scapulae. It then divides into its terminal branches ascending and descending branches.

BRANCHES.

bulletIts terminal part joins C2 ventral ramus to form a nerve trunk that helps to form the following branches-
  1. Muscular branch to sternocleidomastoid
  2. Greater auricular nerve
  3. Lesser occipital nerve
bulletMuscular branch to longus capitis and longus colli
bulletInferior root of ansa cervicalis.

ROOT VALUE: C2.

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