What is platysma muscles??

The platysma muscle is a thin, broad sheet of muscle that is located in the neck and extends from the chest to the lower jaw. It is responsible for various movements of the lower face and neck, including pulling down the corners of the mouth, wrinkling the skin of the neck, and assisting in swallowing. The platysma muscle is innervated by the facial nerve and plays a role in facial expressions and overall facial appearance.