C1 NERVE (SUBOCCIPITAL NERVE)

 

ORIGIN: Spinal cord segment C1.

COURSE/DISTRIBUTION: This nerve takes origin from spinal cord segment C1 and leaves the vertebral canal by passing between the occipital bone and the atlas. It then divides into its dorsal and ventral rami.

Dorsal ramus: This is strictly speaking the actual suboccipital nerve

This lies superior to the arch of atlas and inferior to vertebral artery. It then enters the suboccipital triangle and supplies all the muscles in this triangle. 

Ventral ramus:

Lies above the posterior arch of the atlas and moves forward lateral to the lateral mass and medial to vertebral artery. It descends in front of the lateral process of atlas and posterior to the internal jugular vein. It then joins the ascending branches of C2 nerve. It takes part in the formation of the cervical plexus.

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 rectus lateralis
bulletMuscular branch to rectus capitis anterior
bulletMuscular branch to longus capitis
bulletBranch to vagus nerve
bulletSuperior root of ansa cervicalis.

ROOT VALUE: C1.

 

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Creator: Oluwole Ogunranti


 

  

 

 

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Creator: Oluwole Ogunranti