Depressor labii inferioris muscle
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| Depressor labii | ||
|---|---|---|
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| Muscles of the head, face, and neck. | ||
| Origin: | from the oblique line of the mandible, between the symphysis and the mental foramen, and passes upward and medialward | |
| Insertion: | inserted into the integument of the lower lip, its fibers blending with the Orbicularis oris, and with those of its fellow of the opposite side | |
| Blood: | ||
| Nerve: | facial nerve | |
| Action: | ||
The depressor labii inferioris (or quadratus labii inferioris) is a facial muscle that helps lower the bottom lip.
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[edit] 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.
[edit] Innervation
The depressor labii inferioris is innervated by the facial nerve.
[edit] Actions
This muscle helps to depress the lower lip.
[edit] See also
[edit] External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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