Third Occipital Nerve

Description

Posterolateral head and upper cervical region are rendered with the third occipital nerve traced from the dorsal ramus of C3 as it emerges close to the posterior midline and then courses superiorly toward the occiput. Deep to the trapezius and near the superior nuchal line, the nerve travels in the plane of the suboccipital and semispinalis capitis musculature, then becomes more superficial in the posterior scalp. Adjacent posterior cervical branches of the cervical plexus are suggested by accompanying yellow neural pathways, with muscle fiber direction emphasized in trapezius and occipitalis. Clinically, the third occipital nerve matters because it supplies sensation over the lower occiput and commonly mediates cervicogenic headache arising from the C2 to C3 zygapophysial (facet) joint. Radiofrequency neurotomy and diagnostic blocks target this nerve near the C2 to C3 facet complex, where its course can be variable and where proximity to the medial branch and surrounding deep extensor muscles influences needle trajectory. Small structure. Frequent pain generator. Neurology and pain medicine educators can pair this artwork with modules on upper cervical dorsal rami, occipital neuralgia patterns, and posterior neck dissection planes, while spine intervention texts can use it to orient readers to third occipital nerve block and ablation anatomy. It also fits well in anatomy teaching on the cervical plexus versus dorsal ramus distinction and the layered muscular approach from trapezius to the deep extensors at the craniocervical junction. Anatomical accuracy verified by SciePro's Medical Advisory Board.