Good try! but the skin of the neck is not tense as when platysma is working. Also the upper fibers of platysma (risorius) pull on the angle of the mouth laterally and not downwards. The muscle involved is the one whose action in depressing the angle of the mouth is indicated in its name. Stay tuned for the answer in the upcoming video for the next week. Thanks for your interest in the Channel.
Depressor labia depressor angularis oris mentalis
Levator labii superioris alaeque nasi
Is it the platysma muscle since it attaches to the angle of the mouth?
Good try! but the skin of the neck is not tense as when platysma is working. Also the upper fibers of platysma (risorius) pull on the angle of the mouth laterally and not downwards. The muscle involved is the one whose action in depressing the angle of the mouth is indicated in its name. Stay tuned for the answer in the upcoming video for the next week. Thanks for your interest in the Channel.