Nerves and Muscles of the Head, Posterior View

Description

Posteriorly, the scalp and upper neck are opened to emphasize the occipital belly of occipitofrontalis (occipitalis) spanning the superior nuchal line and converging toward the epicranial aponeurosis, with the auricles positioned laterally as fixed external landmarks. Inferior to the occiput, the upper fibers of trapezius rise from the midline nuchal ligament and external occipital protuberance, framing the posterior cervical triangle on either side. Superficial nerve branches track across these muscle planes in yellow, running lateral to the midline toward the mastoid region and posterior auricle. Cutaneous innervation in the nuchal region is a frequent source of diagnostic confusion. The greater occipital nerve (dorsal ramus of C2) typically ascends between obliquus capitis inferior and semispinalis capitis, then pierces trapezius near the superior nuchal line, a course that correlates with classic occipital neuralgia and tenderness at the occipital nerve emergence point. Lesser occipital nerve fibers (ventral rami of C2 to C3) sweep along the posterior border of sternocleidomastoid toward the scalp behind the ear, a pathway that matters when placing incisions for posterior auricular approaches. One midline. Many crossing trajectories. Educators will find this posterior head and neck plate well suited to teaching surface anatomy of the occiput, layered muscle relationships, and the distinction between cranial motor innervation of scalp musculature and cervical sensory supply to the posterior scalp in gross anatomy, neuroanatomy, and regional anesthesia modules. It also supports atlas and journal figures discussing headache generators, decompression targets, and safe zones for posterior scalp flaps. Anatomical accuracy verified by SciePro's Medical Advisory Board.