The depressor anguli oris (also known as the triangularis menti) is
a small triangular muscle of facial expression located in the lower-jaw
area of the face on both sides of the chin / lower-mouth.
The points of origin and insertion, and the action of the depressor
anguli oris muscles are tabulated below:
Origin |
Insertion |
Action |
External oblique line of the lower jaw (mandible).
|
Angle of the mouth.
|
Affects facial expression by moving skin tissues in the area
of the lower jaw.
|
*Note that some of the fibres of this muscle are
directly continuous with other adjacent muscles [66]. |
|
This is one of the muscles of the head, neck, and face that is included
on the syllabus of many courses in Indian
Head Massage. As this is an increasingly popular therapy we have
added several revision pages that may be helpful to students of Indian
Head Massage. See for example, the page about Skeletal
Structures of the Head and Neck.
To view the location of the depressor anguli oris
muscle, see the page about Facial
Muscles.
Note that this page consists of an interactive (rather than a simply
labelled) diagram, so you'll have to test yourself by guessing which
muscle is the depressor anguli oris until you
find the correct label. It's a fun way to learn !
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