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
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.


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 facial nerve.


This muscle helps to depress the lower lip.

See also

Additional images

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 As such, some of the information contained herein may be outdated.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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