Orbicularis Oris

Written by Max Bidewell

Last updated April 28, 2024 • 8 Revisions •

The orbicularis oris is an oral muscle of facial expression. It is the main sphincter muscle of the lips.

  • Attachments – Arises from the maxilla and from the other muscles of the cheek. It inserts onto the skin and mucous membrane of the lips.
  • Action – Closes the lips to narrow the oral opening.
  • Innervation – Buccal branches of the facial nerve.
  • Blood supply – Superior and inferior labial branches of the facial artery

Fig 1
The main oral muscles of facial expression. Note how the fibres of buccinator and orbicularis oris blend together

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