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From Biology-Online Dictionary | Biology-Online Dictionary
(Science: anatomy, muscle) origin, subcutaneous layer and fascia covering pectoralis major and deltoid at level of first or second rib; insertion, lower border of mandible, risorius and platysma of opposite side; action, depresses lower lip, forms ridges in skin of neck and upper chest when jaws are clenched, denoting stress, anger; nerve supply, cervical branch of facial.
Synonym: platysma, musculus platysma myoides, musculus platysma, musculus subcutaneus colli, musculus tetragonus.