What is the function of the platysma muscle?

The platysma muscle plays a crucial role in supporting the neck and lower face. This broad, thin muscle originates from the upper chest and the shoulder area, extending upward to the jaw and lower face. Its primary function is to help maintain the stability and structure of the neck, which is especially important during various facial movements and actions.

The platysma also contributes to certain facial expressions, especially those related to tension or stress, but its most significant role centers around providing support to the neck region. This is vital, as the neck acts as both a conduit for important structures, such as blood vessels and nerves, and a protective area for the underlying anatomy. By supporting the neck, the platysma aids in maintaining posture and can indirectly influence the positioning of the lower face during movement and expression.