Definition of platysma in US English:


nounPlural platysmata, Plural platysmas

  • A broad sheet of muscle fibers extending from the collarbone to the angle of the jaw.

    • ‘A ptosis of the platysma muscle which hangs down, causes a bad result when using liposuction alone.’
    • ‘A small light aids him as he suctions and cuts out the fat and stitches together the pink platysma muscle.’
    • ‘However, submental electrode placement has the disadvantage of recording from the geniohyoid, mylohyoid, and platysma, as well as the genioglossus, thus complicating interpretation of the signal.’
    • ‘Examination of a patient with Bell's palsy shows impaired facial and platysma muscles causing drooping of the mouth and brow plus difficulty closing the eye or mouth.’
    • ‘The platysma is secured to the mastoid periosteum after raising the lateral platysma flap in order to help define the jaw line and improve contouring in the submandibular region.’


Late 17th century: modern Latin, from Greek platusma ‘flat piece, plate’.