Occipitalis

Origin, Insertion, Action & Nerve

Attachments explained

The Occipitalis is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.

Action & function

When the Occipitalis contracts, it produces the following movements: Retracts the scalp; anchors and tenses the epicranial aponeurosis to assist frontalis.

As part of the Facial Expression group of the Head & Neck, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.

Nerve supply & clinical relevance

The Occipitalis receives its nerve supply from the Posterior auricular branch of facial nerve (CN VII).

Because a muscle can only contract when its nerve is intact, injury to the Posterior auricular branch of facial nerve can weaken or paralyse the Occipitalis, impairing the movements it normally produces (retracts the scalp). This is why knowing the innervation is central to localising nerve lesions in clinical practice.

How to study the Occipitalis (the OIANS method)

Study the occipitalis as the rear anchor of the scalp system: by pulling the epicranial aponeurosis backward from its occipital-bone origin, it gives the frontal belly a fixed point from which to lift the eyebrows. Thinking of it as the muscle that steadies the back of the aponeurotic cap explains why its own movement, scalp retraction, is subtle but important.

Fix its nerve as the posterior auricular branch of the facial nerve (CN VII), which distinguishes it from the frontal belly served by the temporal branch. Remembering that occipitalis and frontalis are simply the two bellies of one occipitofrontalis muscle keeps their shared aponeurosis and common facial-nerve supply logically connected.

Frequently asked questions

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