Depressor labii inferioris muscle
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| 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 | |
| Action: | depress the lower lip | |
| Dorlands/Elsevier | m_22/12548762 | |
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 facial nerve.
Actions
This muscle helps to depress the lower lip.
See also
Additional images
 Mandible. Outer surface. Side view. |
External links
- LUC dli
- -677773235 at GPnotebook
- Depressor+labii+inferioris+muscle at eMedicine Dictionary
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 As such, some of the information contained herein may be outdated.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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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
