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Labial Part of Orbicularis Oris Muscle
Muscular System

Labial Part of Orbicularis Oris Muscle

Pars labialis musculi orbicularis oris

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Quick Facts

Origin: Vermillion line.

Insertion: Skin and fascia of lips.

Action: Compresses and protrudes lips.

Innervation: Buccal and marginal mandibular branches of facial nerve (CN VII).

Arterial Supply: Superior and inferior labial, infraorbital, and transverse facial arteries.

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The orbicularis oris muscle is an annular muscle consisting of an outer marginal part and an inner labial part. The inner labial part of the muscle arises from the vermillion line.


The fibers from the labial part extend into the submucosa of the lips and extend laterally to the base of the modiolus of angulus oris.


Overall, the orbicularis oris muscle compresses and protrudes the lips (Netter, 2011). This action is used when pursing the lips and whistling.

List of Clinical Correlates

- Bell’s palsy


Netter, F. H. (2011) Atlas of Human Anatomy. Netter Basic Science Series: Saunders/Elsevier.

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