Greater Occipital Nerve, Gross Anatomy

Description

Posterior head and upper cervical anatomy is rendered with emphasis on the greater occipital nerve (C2 dorsal ramus) as it ascends from the suboccipital region toward the scalp vertex. After emerging inferior to the inferior oblique (obliquus capitis inferior), the nerve courses superiorly and posteriorly, passing deep to the semispinalis capitis and then piercing the trapezius aponeurosis near the superior nuchal line to become superficial in the occipital scalp. Nearby relationships are maintained with the sternocleidomastoid laterally, trapezius medially and posteriorly, and the occipital artery and vein tracking in close proximity along the posterolateral scalp. Small occipital nerve branches and accompanying vascular arborization are shown in the subcutaneous tissue. Clear, surgical anatomy. This pathway matters because the greater occipital nerve is the dominant sensory supply to the posterior scalp, and its points of muscular/aponeurotic penetration are common sites of entrapment in occipital neuralgia and cervicogenic headache. Clinicians targeting greater occipital nerve blocks often use the occipital artery pulse and the superior nuchal line as surface landmarks, so a depiction that pairs the nerve with regional vasculature helps explain both diagnostic tenderness and the need to avoid intravascular injection. For posterior approaches to the upper cervical spine and suboccipital decompression, the nerve’s relationship to semispinalis capitis and trapezius guides safe dissection planes and retraction. Neuroanatomy and regional anatomy courses will find this plate useful when teaching dorsal rami, cutaneous innervation of the scalp, and the layered musculature of the posterior neck. It also suits headache medicine lectures, anesthesiology references on landmark-guided injections, and operative atlases covering posterior cervical exposure. Anatomical accuracy verified by SciePro's Medical Advisory Board.