Depressor labii inferioris muscle
| Depressor labii | |
|---|---|
 Muscles of the head, face, and neck. | |
| Details | |
| Latin | musculus depressor labii inferioris |
| oblique line of the mandible, between the symphysis and the mental foramen | |
| integument of the lower lip, Orbicularis oris fibers, its fellow of the opposite side | |
| facial nerve - Mandibular branch | |
| Actions | Depression of the lower lips |
| Identifiers | |
| Gray's | p.383 |
| Dorlands /Elsevier | m_22/12548762 |
| TA | A04.1.03.033 |
| FMA | 46816 |
| Anatomical terms of muscle | |
The depressor labii inferioris (or quadratus labii inferioris) is a facial muscle that helps lower the bottom lip.
Structure
This muscle arises from the oblique line of the mandible, and inserts on the skin of the lower lip, blending in with the orbicularis oris muscle. At its origin, depressor labii is continuous with the fibers of the platysma muscle. Much yellow fat is intermingled with the fibers of this muscle.
Innervation
The depressor labii inferioris is innervated by the mandibular division of the facial nerve.
Actions
This muscle helps to depress the lower lip.
See also
- Facial muscles
- Depressor anguli oris
Additional images
-
Position of depressor labii inferioris muscle (red).
-
Mandible. Outer surface. Side view.
References
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
External links
- -677773235 at GPnotebook
- Depressor+labii+inferioris+muscle at eMedicine Dictionary
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||