Orbicularis oris muscle
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At the time the article was created Daniel J Bell had no recorded disclosures.
View Daniel J Bell's current disclosuresAt the time the article was last revised Jeremy Jones had no financial relationships to ineligible companies to disclose.
View Jeremy Jones's current disclosures- Orbicularis oris muscles
- Musculus orbicularis oris
- Orbicular muscle of the mouth
- Orbicularis oris
- Orbicular muscles of the mouth
The orbicularis oris muscle, also known as the orbicular muscle of the mouth, (TA: musculus orbicularis oris) is one of the facial muscles and its primary action is as the sphincter of the mouth.
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Gross anatomy
Orbicularis oris muscle comprises both its own fibers and those lent from the dilator muscles of the mouth, mainly the buccinator muscle. Orbicularis oris is subdivided into four quadrants (upper, lower, right, and left). Each quadrant consists of a major peripheral portion and a smaller marginal portion in the vermillion of the upper and lower lips.
Arterial supply
muscular branches of the facial artery
Venous drainage
muscular tributaries of the facial vein
Innervation
buccal and marginal mandibular branches of the facial nerve (VII)
Action
as the sphincter of the mouth and lips, contraction of orbicularis oris decreases the size of the mouth, with pursing of the lips, i.e. whistling action
References
- 1. William Alexander Newman Dorland. Dorland's Illustrated Medical Dictionary. (2007) ISBN: 9781416023647 - Google Books
- 2. Chummy S. Sinnatamby. Last's Anatomy. (2011) ISBN: 9780702033940 - Google Books
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