Depressor labii inferioris muscle

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Depressor labii
Depressor labii inferioris.png
Muscles of the head, face, and neck.
Details
Latin musculus depressor labii inferioris
oblique line of the mandible, between the symphysis and the mental foramen
integument of the lower lip, Orbicularis oris fibers, its fellow of the opposite side
facial nerve - Mandibular branch
Actions Depression of the lower lips
Identifiers
Gray's p.383
Dorlands
/Elsevier
m_22/12548762
TA A04.1.03.033
FMA FMA:46816
Anatomical terms of muscle

The depressor labii inferioris (or quadratus labii inferioris) is a facial muscle that helps lower the bottom lip.

Structure[edit]

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[edit]

The depressor labii inferioris is innervated by the mandibular division of the facial nerve.

Actions[edit]

This muscle helps to depress the lower lip.

See also[edit]

Additional images[edit]

External links[edit]

This article incorporates text from a public domain edition of Gray's Anatomy.