Platysma

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Original Editor - Manisha Shrestha

Top Contributors - Jacintha McGahan, Manisha Shrestha and Kim Jackson

Description

Platysma is a broad, thin sheet like muscle that lies superficially at the anterolateral aspect of neck bilaterally.

Origin

It originates in the upper thoracic and shoulder regions from a fascia that covers the pectoralis major and deltoid muscles.

Insertion

The fibers travel superomedially over the anterolateral aspect of the neck, to insert on the mandible, the skin and subcutaneous tissue of the lower face.

Nerve

Cervical branch of facial nerve (CN VII).

Blood Supply

Submental branch of the facial artery, and suprascapular branch of the thyrocervical trunk.

Function

• Aids facial expression by lowering the inferior lips.
• Depresses mandible.
• Tenses the skin of the anterior neck.
• Releases pressure of the skin on the subjacent veins.

Clinical relevance

• Dissimilar to other muscles of the body that lie deep to the subcutaneous tissue, the platysma is located within the subcutaneous tissue of the neck (superficial layer of the cervical fascia). Its superficial position means that surgical dissections of the neck most acknowledge the underlying neurovascular structures.
• Platysma band are one of the first signs of the ageing of the neck. It is also known as turkey neck. It occurs due to the decrease muscle tone leading to thinning and shortening of muscle.
• Platysma Synkinesis in Facial palsy- Common facial synkinesis involves mouth movements and is triggered by blinking or eye narrowing while smiling or lip puckering. Platysma synkinesis is frequent in patients affected by sequelae of facial palsy. It can lead to static and dynamic asymmetry of the neck and of the inferior parts of the face. it may causes discomfort, aesthetic concerns and functional impairment.botulinum Toxin type A had shown reduction in Platysma synkinesis.

Assessment

It can be activated by asking the patient to forcefully depress and draw the lower lip laterally whilst maintaining the mandible in a position of slight depression.