platysma muscle


pla·tys·ma mus·cle

(plă-tiz'mă mŭs'ĕl) 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(s): platysma [TA] .

platysma muscle

Neck and facial muscle. Origin: superficial fascia of upper chest. Insertion: skin of lower face. Nerve: facial (CN VII). Action: lowers jaw, widens neck. See: face and headfor illus.See also: muscle

pla·tys·ma mus·cle

(plă-tiz'mă mŭs'ĕl) 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(s): platysma [TA] .