Which muscle extends from the tip of the chin to the shoulder and lowers the jaw and lip?

The muscle that extends from the tip of the chin to the shoulder and is responsible for lowering the jaw and lip is the platysma. This broad, thin muscle covers the neck and parts of the lower face. Its primary function includes lowering the mandible (the jaw) and the corners of the mouth, which contributes to facial expressions such as sadness or despair. The platysma helps in various movements involving the neck and jaw, and it plays an important role when expressing emotions or during specific movements like talking and eating.

Understanding the role and anatomy of the platysma is crucial for anyone studying hair cutting or beauty, as it relates closely to the overall aesthetics of the face and neck, impacting how hairstyles enhance facial features.