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:	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
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.

Contents 1 Structure 2 Innervation 3 Actions 4 See also 5 Additional images 6 External links

[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

• Facial muscles
• Depressor anguli oris

[edit] Additional images

Mandible. Outer surface. Side view.

[edit] External links

• LUC dli
• GPnotebook -677773235
• Dictionary at eMedicine Depressor+labii+inferioris+muscle

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 As such, some of the information contained herein may be outdated.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