The platsyma muscle is a thin flat support layer of muscle beneath the skin in the neck. It provides a smooth contour and protection over the underlying nerves, vessels and other structures of the neck. With time the edge of this muscle between the chin and sternum becomes prominent, either from loosening or enlargement. This leads to a blunting effect on the angle between the chin and neck. In thinner people, the muscle edges can often be seen as vertical bands or cords. Most of the time, the appearance can be improved by a combination of firming them with sutures or weakening them with relaxing incisions. Other times, Botox and similar injections can relax the muscle to make it less noticeable. The majority of the time, a platysmaplasty is performed with another procedure to firm the overlying skin.