Depressor anguli oris muscle

The depressor anguli oris (triangularis) is a facial muscle associated with frowning. It originates from the mandible and inserts into the angle of the mouth.

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).
Details
OriginTubercle of mandible
InsertionModiolus of mouth
ArteryFacial artery
NerveMandibular branch of facial nerve
ActionsDepresses angle of mouth
Identifiers
LatinMusculus depressor anguli oris
TA98A04.1.03.026
TA22076
FMA46828
Anatomical terms of muscle

The muscle is innervated by the marginal mandibular branch of the facial nerve and receives its blood supply from the facial artery.

Anatomy

The depressor anguli oris arises from the oblique line of the mandible, whence its fibres 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.

Function

The depressor anguli oris is a muscle of facial expression. The muscle depresses the corner of the mouth which is associated with frowning.

See also

Additional images
  • Position of depressor anguli oris muscle
  • Mandible, outer surface, side view
  • The arteries of the face and scalp

References

This article incorporates text in the public domain from page 383 of the 20th edition of Gray's Anatomy (1918)

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