Dorlands/Elsevier m_22/12548762 | ||
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Actions Depression of the lower lips Latin musculus depressor labii inferioris | ||
The depressor labii inferioris (or quadratus labii inferioris) is a facial muscle that helps lower the bottom lip.
Contents
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 mandibular division of the facial nerve.
Actions
This muscle helps to depress the lower lip.
References
Depressor labii inferioris muscle Wikipedia(Text) CC BY-SA