Lateral Perspective of the Lesser Occipital Nerve

Description

Arising from the anterior rami of C2 (often with C3) within the cervical plexus, the lesser occipital nerve is traced in lateral profile as it ascends along the posterior border of the sternocleidomastoid muscle toward the mastoid process and lateral occiput. Its superficial course is framed anteriorly by the sternocleidomastoid and posteriorly by the splenius capitis and upper trapezius, with the nerve piercing the deep cervical fascia near the superior nuchal line to supply cutaneous sensation. Superficial venous and arterial channels accompany the regional landmarks, including the external jugular vein coursing superficial to sternocleidomastoid and branches of the occipital and posterior auricular arteries near the auricle. Clear landmarks. Clinical relevance hinges on where the nerve becomes superficial along the posterior margin of sternocleidomastoid at the level of the upper cervical spine, a common site of entrapment and a reliable target for diagnostic and therapeutic blocks in occipital neuralgia and cervicogenic headache patterns. Surgeons also track this nerve during posterior cervical approaches and during procedures near the mastoid and retroauricular region, where iatrogenic injury can leave persistent dysesthesia over the lateral scalp and posterior auricle. The relationship to the parotid region, facial nerve branches, and the great auricular nerve helps differentiate sensory territories when evaluating postoperative numbness after parotidectomy or facelift incisions. Ideal for teaching cervical plexus branches in gross anatomy, head and neck regional anatomy, and anesthesia curricula that cover superficial cervical plexus blocks and occipital nerve blocks. It also suits operative atlases and clinic handouts that map scalp sensory loss or pain referral around the auricle and lateral occiput. Anatomical accuracy verified by SciePro's Medical Advisory Board.