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Description
Platysma is a broad thin sheetlike muscle which lies superficially at the anterolateral aspect of neck bilaterally.
Origin
Originate from the fascia covering the superior pectoralis major and deltoid muscles below the clavicle and run upwards and medially.
Insertion
Anterior fibres, to the base of the mandible; posterior fibres to the skin of the lower face and
Nerve
Cervical branch of facial nerve (7th cranial nerve).
Blood Supply
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
- 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 mucle tone leading to thinning and shortening of muscles.
- 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
Treatment
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