Buccinator

Origin, Insertion, Action & Nerve

Attachments explained

The Buccinator 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 Buccinator contracts, it produces the following movements: Compresses cheek against teeth during chewing; keeps food on occlusal surface; aids blowing.

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 Buccinator receives its nerve supply from the Buccal branch of facial nerve (CN VII).

Because a muscle can only contract when its nerve is intact, injury to the Buccal branch of facial nerve can weaken or paralyse the Buccinator, impairing the movements it normally produces (compresses cheek against teeth during chewing). This is why knowing the innervation is central to localising nerve lesions in clinical practice.

How to study the Buccinator (the OIANS method)

OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Buccinator, 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 Buccinator 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.

Buccinator quick facts

Region

Head & Neck

Group

Facial Expression

Origin

Alveolar processes of maxilla and mandible, and pterygomandibular raphe

Insertion

Angle of the mouth, blending with orbicularis oris

Action

Compresses cheek against teeth during chewing; keeps food on occlusal surface; aids blowing

Nerve

Buccal branch of facial nerve (CN VII)

Spinal roots

—

Frequently asked questions

Related muscles