Orbicularis Oris muscle

Authors

Affiliations

Nathaniel Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

OIAN

Muscle	Origin	Insertion	Nerve	Action
Orbicularis Oris	/The Archive/Anatomy/Skeletal Muscles/Head and Neck/Muscles of Facial Expression/orbicularis_oris.html#origin	/The Archive/Anatomy/Skeletal Muscles/Head and Neck/Muscles of Facial Expression/orbicularis_oris.html#insertion	?var:ref-orbicularis-oris.nerve	/The Archive/Anatomy/Skeletal Muscles/Head and Neck/Muscles of Facial Expression/orbicularis_oris.html#action

Origin

Deep surface of skin; Superiorly: maxilla (median plane); Inferiorly: mandible¹

Insertion

Mucous membrane of lips¹

Innervation

Facial Nerve CN VII¹

Action

Acts as oral sphincter:¹

• Compresses and protrudes lips (whistling, sucking, kissing)¹
• Resists distension (when blowing)¹

Clinical Significance

1.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.