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Depressor Labii Inferioris
Muscular System

Depressor Labii Inferioris

Depressor labii inferioris

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Quick Facts

Origin: Oblique line of mandible.

Insertion: Middle portion of lower lip.

Action: Depresses lower lip.

Innervation: Marginal mandibular branch of facial nerve (CN VII).

Arterial Supply: Inferior labial artery and mental branch of inferior alveolar artery.

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The depressor labii inferioris muscle originates from the oblique line of the mandible, which sits between the mental symphysis and the mental foramen of the mandible (Standring, 2016).


The fibers of the depressor labii inferioris muscle blend with the orbicularis oris muscle. It also blends with the platysma muscle inferiorly.


The depressor labii inferioris muscle depresses the lower lip. This action is used during mastication and when expressing some facial expressions (Standring, 2016).

List of Clinical Correlates

- Bell’s palsy


Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

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