Orbicularis oris muscle
Last revised by Daniel J Bell ◉ on 22 Sep 2021
Citation, DOI, disclosures and article data
Citation:
Bell D, Orbicularis oris muscle. Reference article, Radiopaedia.org (Accessed on 27 Mar 2023) https://doi.org/10.53347/rID-73178
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rID:
73178
Article created:
29 Dec 2019, Daniel J Bell ◉
Disclosures:
At the time the article was created Daniel J Bell had no recorded disclosures.
View Daniel J Bell's current disclosuresLast revised:
22 Sep 2021, Daniel J Bell ◉
Disclosures:
At the time the article was last revised Daniel J Bell had no recorded disclosures.
View Daniel J Bell's current disclosuresRevisions:
4 times, by 1 contributor - see full revision history and disclosures
Systems:
Sections:
Synonyms:
- 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.
On this page:
Gross anatomy
Orbicularis oris muscle comprises both of 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. (2018) ISBN: 9781416023647
- 2. Chummy S. Sinnatamby. Last's Anatomy. (2018) ISBN: 9780702033940
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