The
panniculus carnosus is a part of the
subcutaneous tissues in the study of animal anatomy. It is a layer of striated muscle deep to the
panniculus adiposus. In humans the
platysma muscle of the neck, palmaris brevis in the hand, and the dartos muscle in the scrotum are described as a discrete muscle of the panniculus carnosus. Some of the muscles of facial expression in the head are part of the panniculus carnosus. In other parts of the body, the layer is vestigial, and may be absent or may exist only as microscopic, disconnected fibers.