AnatomyDeck

Muscle

Platysma

Muscle of facial expression (neck)

Head & neckMuscular system

High-yield

Muscle of facial expression → facial nerve (CN VII, cervical branch), not a strap muscle.

Overview

A broad superficial sheet of muscle in the neck, a muscle of facial expression that tenses the neck skin and depresses the lower lip.

Reference facts

  • Origin

    Fascia over the pectoralis major and deltoid

  • Insertion

    Mandible, skin of the lower face, and angle of the mouth

  • Action

    Tenses the skin of the neck; depresses the mandible and angle of the mouth (grimacing)

  • Innervation

    Cervical branch of the facial nerve (CN VII)

  • Blood supply

    Submental / suprascapular arteries

Your notes