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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