Depressor anguli oris muscle

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Depressor anguli oris
Scheme showing arrangement of fibers of Orbicularis oris. (Triangularis labeled at bottom right.)
Muscles of the head, face, and neck. (Labeled as triangularis near chin.)
Latin musculus depressor anguli oris
Gray's subject #108 383
Origin: tubercle of mandible
Insertion: modiolus of mouth
Artery: facial artery
Nerve: mandibular branch of facial nerve
Action: depresses angle of mouth
Dorlands/Elsevier m_22/12548753

The Depressor anguli oris (Triangularis) arises from the oblique line of the mandible, whence its fibers converge, to be inserted, by a narrow fasciculus, into the angle of the mouth.

At its origin it is continuous with the Platysma, and at its insertion with the Orbicularis oris and Risorius; some of its fibers are directly continuous with those of the Caninus, and others are occasionally found crossing from the muscle of one side to that of the other; these latter fibers constitute the Transversus menti.

It is a muscle of facial expression associated with frowning.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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