Lesser Occipital Nerve

Description

Arising from the cervical plexus, the lesser occipital nerve (C2, with variable C3 contribution) ascends along the posterior border of the sternocleidomastoid muscle, then turns superiorly toward the lateral occiput and postauricular scalp. From a posterolateral head and neck perspective, its cutaneous branches would be seen coursing superficial to the deep cervical fascia as they approach the area posterior and superior to the auricle, closely paralleling the occipital artery and small accompanying veins. Nearby muscular landmarks commonly visible in this region include the sternocleidomastoid laterally, splenius capitis and semispinalis capitis posteriorly, and the posterior belly of the digastric and mastoid process superiorly. Clean topography matters here. Entrapment or irritation of the lesser occipital nerve is a recognized source of occipital neuralgia and postauricular dysesthesia, often described as burning pain behind the ear and along the lateral occipital scalp. This posterolateral course also explains why symptoms can follow surgical scars and traction around the mastoid and upper neck, including procedures near the posterior border of sternocleidomastoid, and why targeted nerve blocks are typically placed just posterior to that border at the level of the upper cervical spine. The relationship to the great auricular nerve and greater occipital nerve is a recurring teaching point when differentiating sensory territories in the posterior scalp. Anatomy instructors can drop this plate directly into head and neck gross anatomy, dental anatomy, and anesthesia teaching files to anchor cervical plexus cutaneous branches to palpable landmarks. Medical publishers will also find it suitable for chapters on occipital neuralgia, regional anesthesia (lesser occipital nerve block), and postoperative sensory deficits after mastoid or upper cervical approaches. Anatomical accuracy verified by SciePro's Medical Advisory Board.