Platysma muscle

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Description:

Origin:
Fascia over the upper anterior thorax and deltoid muscle

Insertion:
Fibers interdigitate with opposite muscle at the midline of the mandible, they attach to the body of the mandible, blend with muscles near the angle of the mouth, and insert into the skin over the mandible

Actions:
Tightens the skin of the neck and helps lower the mandible

Nerve supply:
Facial nerve

Blood supply:
Branches of the external carotid artery