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.)
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
Actions	depresses angle of mouth

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.

External links

• LUC dao
• -684392371 at GPnotebook
• depressor+anguli+oris+muscle at eMedicine Dictionary
• PTCentral

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.