Orbicularis oris |
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Orbicularis oris
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The orbicularis oris (Latin: musculus orbicularis oris) is a circular-shaped facial muscle that is located around the mouth. It is classified as the buccolabial facial muscle. The orbicularis oris is composed of two main parts, named the marginal (smaller) and peripheral parts (larger). The marginal is the inner, while the peripheral is the outer part of the muscle. Superior and inferior aspects of both parts stretch between the right and left modiolus. The modiolus is a fibromuscular structure at each angle of the mouth. It is a connection site where several buccolabial facial muscles meet and blend with each other.  Orbicularis oris, buccinator and mentalis by Anatomy NextOrbicularis orisOriginModiolus, skin and muscles of mouthInsertionSkin and mucous membrane of lipsActionCloses mouth, pushes lips forward Innervation Buccal branch of facial nerve (CN VII)Blood supplySuperior and inferior labial arteries of facial artery, mental and infraorbital arteries of maxillary artery, transverse facial artery of superficial temporal arteryOrigin The fibers of the marginal and peripheral parts of the orbicularis oris muscle originate from the modiolus, skin of the mouth and other muscles of facial expression. Insertion Both parts of the muscle insert in the skin and mucous membrane of the lips. Action The orbicularis oris muscle closes the mouth and pushes the lips forward (protrudes the lips).  Orbicularis oris, levator anguli oris, depressor anguli oris and zygomaticus major by Anatomy NextInnervation Both parts of the orbicularis oris are innervated by the buccal branch of the facial nerve (CN VII). Blood supply The orbicularis oris is supplied with the arterial blood mainly by the superior and inferior labial branches of the facial artery, mental and infraorbital branches of the maxillary artery and transverse facial branch of the superficial temporal artery. |
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