The platysma is a pharyngeal arch 2 muscle and a superficial facial muscle that participates in oral/pharyngeal behaviors and is innervated by the cervical branch of the facial nerve, and attaches to the skin.[FEED]

One of these (facial muscles in mammals), the platysma, is an unspecialized muscle derived from the hyoid arch.[well established][VHOG]

Human variation notes: Variations occur in the extension over the face and over the clavicle and shoulder; it may be absent or interdigitate with the muscle of the opposite side in front of the neck; attachment to clavicle, mastoid process or occipital bone occurs. A more or less independent fasciculus, the occipitalis minor, may extend from the fascia over the trapezius to fascia over the insertion of the sternocleidomastoideus.

http://upload.wikimedia.org/wikipedia/commons/f/fb/Platysma.png

neck platysma muscle

platysma cervicale, platysma myoides

uberon

UBERON:0005467

Platysma

https://github.com/obophenotype/uberon/issues/472

• temporalis muscle

• deep cervical fascia

• zygomaticus major muscle
• risorius muscle