Cremaster is a muscle that controls the movement of the testicles in most mammals. This muscle is located in the inguinal canal and is responsible for pulling the testicles closer to the body in response to external stimuli such as temperature changes or excitement. Synonyms for cremaster include muscle layer, suspensory ligament, and scrotal muscle. The cremaster muscle has a unique function, and thus it may not have perfect synonyms, but it can be loosely referred to as a muscle that is responsible for the movement of the testicles. Understanding the physiological function of this muscle can help medical professionals to diagnose and treat certain disorders affecting the male reproductive system.