| Depressor labii | |
|---|---|
| Muscles of the head, face, and neck. | |
| Latin | musculus depressor labii inferioris |
| Gray's | subject #108 383 |
| 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 |
| Artery | |
| Nerve | facial nerve |
| Actions | {{{Action}}} |
The depressor labii inferioris (or quadratus labii inferioris) is a facial muscle that helps lower the bottom lip.
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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.
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 As such, some of the information contained within it may be outdated.
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