Anatomy study note · Head and neck

Platysma

A thin muscular sheet in the superficial fascia of the neck; a facial muscle supplied by the facial nerve.

Key points

• Superficial fascia of the neck.
• Cervical branch of VII.
• Pulls down the corner of the mouth.
• From the second (hyoid) pharyngeal arch → facial nerve.
• Skeletal muscle: multinucleated, peripheral nuclei, striated.
• Epimysium → perimysium → endomysium.

The full note in the atlas also covers

Origin · Insertion · Action · Nerve supply · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 12, PDF pp. 1615–1618, 1674–1675
• Inderbir Singh’s Human Embryology, ch. 9, PDF pp. 120, 122, 125
• BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144

More from the head and neck

• Pons
• Postcentral gyrus
• Posterior cerebral artery
• Posterior cricoarytenoid
• Precentral gyrus
• Retina
• Salpingopharyngeus
• Scalenus anterior
• Scalenus medius and posterior
• Sclera
• Skull
• Sphenoid bone

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