Medical Definition of Musculus tetragonus
1.
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.
(05 Mar 2000)
Lexicographical Neighbors of Musculus Tetragonus
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