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)

OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Occipitalis, work through them in order: picture its origin, trace the muscle to its insertion, reason out the action that shortening between those two points must create, then add the nerve that drives it.

Most students remember the Occipitalis fastest by linking its action back to its attachments rather than memorising each fact in isolation. Once the origin and insertion make sense, the action usually follows logically.

Occipitalis quick facts

Region

Head & Neck

Group

Facial Expression

Origin

Lateral two-thirds of superior nuchal line of occipital bone and mastoid part of temporal bone

Insertion

Epicranial aponeurosis (galea aponeurotica)

Action

Retracts the scalp; anchors and tenses the epicranial aponeurosis to assist frontalis

Nerve

Posterior auricular branch of facial nerve (CN VII)

Spinal roots

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Frequently asked questions

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