Occipitofrontalis Muscle, Posterior View

Description

Seen from the posterior scalp, the occipital belly (occipitalis) of the occipitofrontalis (epicranius) occupies the superior nuchal region, its fibers running superiorly from the lateral two thirds of the superior nuchal line and adjacent occipital bone to blend into the galea aponeurotica (epicranial aponeurosis). Laterally, the muscle approaches the mastoid region and superior auricular area, where the posterior auricular muscle and the posterior auricular artery typically lie in close neighborhood. Inferior to the occipitalis, the upper cervical midline and the superficial posterior neck contours provide context for the scalp–neck junction. Fiber direction is obvious. A posterior view of the occipitofrontalis matters because the galea aponeurotica forms the key tendon-like sheet of the scalp, transmitting force between the occipitalis posteriorly and the frontalis anteriorly, and it behaves predictably in trauma and surgery. Scalp lacerations that violate the galea tend to gape widely because the paired bellies retract, and the loose areolar tissue deep to the galea provides a plane for blood or infection to track, classically spreading across the calvaria but stopping at the attachments near the zygomatic arch and superior nuchal lines. In coronal and occipital scalp incisions, preserving the posterior auricular branch of the facial nerve helps maintain occipitalis function and avoids postoperative asymmetry in scalp movement and tension on wound closure. Use this illustration for head and neck anatomy labs, plastic surgery and neurosurgery teaching on scalp layers and incision planning, and medical publishing content that needs accurate naming of the epicranius and its aponeurosis in posterior projection. It also suits dermatologic surgery and emergency medicine references on galeal lacerations and scalp avulsion patterns. Anatomical accuracy verified by SciePro's Medical Advisory Board.