Depressor labii inferioris

Anatomy

Origin:
Anterior part of the oblique line of the mandible.

Insertion:
Lower lip at the midline.

Key Relations:
Merges with fibres from the same muscle on the opposite side and from orbicularis oris.

Functions

Draws lower lip downwards and laterally.

Supply

Nerve Supply:
Buccal and mandibular branches of the facial nerve (CN 7).

Blood Supply:
Inferior labial branch of the facial artery.

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