Depressor labii inferioris muscle
The depressor labii inferioris (or quadratus labii inferioris) is a facial muscle that helps lower the bottom lip.
Muscles of the head, face, and neck.
|Origin||oblique line of the mandible, between the symphysis and the mental foramen|
|Insertion||integument of the lower lip, Orbicularis oris fibers, its fellow of the opposite side|
|Nerve||facial nerve - Mandibular branch|
|Actions||Depression of the lower lips|
|Latin||musculus depressor labii inferioris|
|Anatomical terms of muscle|
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.
The depressor labii inferioris is innervated by the mandibular division of the facial nerve.
This muscle helps to depress the lower lip.
- Position of depressor labii inferioris muscle (red).
- Mandible. Outer surface. Side view.
This article incorporates text in the public domain from page 383 of the 20th edition of Gray's Anatomy (1918)
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