
1) Facial muscle 2) Neck muscle in the human body
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https://www.crosswordclues.com/clue/platysma

broad sheet of muscle in the neck
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http://phrontistery.info/p.html

<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, ce...
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http://www.encyclo.co.uk/local/20973

(plә-tiz´mә) a subcutaneous neck muscle extending from the neck to the clavicle, acting to wrinkle the skin of the neck and to depress the jaw.
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http://www.encyclo.co.uk/local/21001
(muscle) Type: Term Definitions: 1. 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 ...
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http://www.medilexicon.com/medicaldictionary.php?t=56985

Type: Term Pronunciation: plă-tiz′mă, -tiz′mă-tă Synonyms: platysma (muscle)
Found on
http://www.medilexicon.com/medicaldictionary.php?t=69630

The platysma (platysma myoides) muscle is a broad, thin sheet of muscle that originates in the pectoral and deltoid muscles and runs upward over the collar bone and inward along each side of the neck and in the skin near the mandible. It is innervated by the facial nerve (VII cranial nerve) and supplied by branches of the internal carotid artery. T...
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http://www.probertencyclopaedia.com/browse/EP.HTM

[
n] - either of two broad muscles located on either side of the neck and innervated by the facial nerve
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http://www.webdictionary.co.uk/definition.php?query=platysma

platysma, spread out flat.
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https://aclandanatomy.com/Glossary.aspx
noun either of two broad muscles located on either side of the neck and innervated by the facial nerve; extends from lower jaw to clavicle and is involved in moving the mouth and jaw
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https://www.encyclo.co.uk/local/20974

Greek = flat object; hence, the flat subcutaneous muscle extending from below the clavicle to the mouth.
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https://www.encyclo.co.uk/local/21450
No exact match found.