The depressor labii inferioris (also known as the Quadratus menti)
is a small quadrilateral muscle 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
labii inferioris muscles are tabulated below:
Origin |
Insertion |
Action |
External oblique line of the lower jaw (mandible).
|
Integument (skin) of the lower lip.
|
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 muscle also contains much yellow fat intermingled in among
its fibres. |
|
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 labii inferioris
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 labii inferioris until
you find the correct label. It's a fun way to learn !
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