platysma

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platysma

 [plah-tiz´mah]
a subcutaneous neck muscle extending from the neck to the clavicle, acting to wrinkle the skin of the neck and to depress the jaw. See Appendix 3-4.

pla·tys·ma (mus·cle)

[TA]
facial muscle in neck region; 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.

platysma

/pla·tys·ma/ (plah-tiz´mah) a platelike muscle that originates from the fascia of the cervical region and inserts in the mandible and the skin around the mouth. It wrinkles the skin of the neck and depresses the jaw.

platysma

[plətiz′mə]
Etymology: Gk, platys, broad
one of a pair of platelike, wide muscles at the side of the neck. It arises from the fascia covering the superior parts of the pectoralis major and the deltoideus, crosses the clavicle, and rises obliquely and medially along the side of the neck. The platysma covers the external jugular vein as the vein descends from the angle of the mandible to the clavicle. The platysma is innervated by the cervical branch of the facial nerve and serves to draw down the lower lip and the corner of the mouth. When the platysma fully contracts, the skin over the clavicle is drawn toward the mandible, increasing the diameter of the neck.

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

The broad, flat muscle lying immediately under the skin of the neck, from the shoulders to the point of the chin. The action of the platysma is to tighten the skin of the neck, pull down the corners of the mouth and lower the jaw.

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

the superficial sheet of cutaneous muscle over the face and neck.