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.
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.
|Its terminal part
joins C2 ventral ramus to form a nerve trunk that helps to form the following
|Muscular branch to rectus lateralis|
|Muscular branch to rectus capitis anterior|
|Muscular branch to longus capitis|
|Branch to vagus nerve|
|Superior root of ansa cervicalis.|
ROOT VALUE: C1.
Electronic School of Medicine
Creator: Oluwole Ogunranti