AnatomyDeck

Muscle

Orbicularis oris

Closes and purses the lips

Head & neckMuscular system

High-yield

Sphincter of the mouth (kissing muscle); CN VII (buccal/mandibular branches).

Overview

The sphincter muscle of the mouth that closes and protrudes the lips for speech, whistling, and kissing. A muscle of facial expression (CN VII).

Reference facts

  • Origin

    Maxilla, mandible, and surrounding facial muscles near the mouth

  • Insertion

    Skin and mucous membrane of the lips

  • Action

    Closes, compresses, and protrudes the lips

  • Innervation

    Buccal and marginal mandibular branches of the facial nerve (CN VII)

  • Blood supply

    Facial artery (labial branches)

Your notes