Depressor anguli oris muscle

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
Origin	tubercle of mandible
Insertion	modiolus of mouth
Artery	facial artery
Nerve	mandibular branch of facial nerve
Actions	depresses angle of mouth
Identifiers
Latin	musculus depressor anguli oris
TA98	A04.1.03.026
TA2	2076
FMA	46828
Anatomical terms of muscle

The Depressor anguli oris (Triangularis) 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.

Anatomy

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

It is a muscle of facial expression associated with frowning.

See also

• Transverse muscle of the chin

Additional images

• 
  Mandible. Outer surface. Side view.
• 
  The arteries of the face and scalp.
• 
  Depressor anguli oris muscle

External links

• Template:MuscleLoyola
• . GPnotebook https://www.gpnotebook.co.uk/simplepage.cfm?ID=-684392371. {{cite web}}: Missing or empty |title= (help)
• Template:EMedicineDictionary
• PTCentral

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