Platysma Muscle 01

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Platysma muscle is a broad sheet arising from the fascia covering the upper parts of the pectoralis major and deltoid; its fibers cross the clavicle, and proceed obliquely upward and medially along the side of the neck. When in action it produces a slight wrinkling of the surface of the skin of the neck in an oblique direction. It’s anterior portion, the thickest part of the muscle, depresses the lower jaw; it also serves to draw down the lower lip and angle of the mouth in the expression of melancholy, i.e. grimacing.

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September 16 2009