The subscapularis is a muscle that lies in the upper and outer part of the shoulder, beneath the scapula bone. This muscle allows for internal rotation of the shoulder, and it is important for upper body strength and mobility. Synonyms for the subscapularis muscle include musculus subscapularis, subscap, and subscapularis muscle. In anatomy and medical terminology, it is often referred to as the "subscap." Additionally, it is sometimes referred to as the "rotator cuff muscle," as it is one of the four muscles that make up the rotator cuff. Understanding the synonyms and names associated with the subscapularis is important for medical professionals and those studying anatomy and physiology.