subscapularisas

Subscapularisas is not a standard term in contemporary human anatomy. It may appear as a plural form in some texts or as a misspelling or variant of subscapularis, the muscle that forms part of the rotator cuff. In most current English-language sources, the singular term subscapularis is used, and its plural concept, when needed, is conveyed through standard anatomical pluralization.

Anatomy and location

The subscapularis muscle lies on the anterior surface of the scapula, occupying the subscapular fossa. Its fibers converge to form a tendon that typically inserts on the lesser tubercle of the humerus and blends with the anterior joint capsule. The muscle acts as a dynamic stabilizer of the glenohumeral joint by resisting anterior translation of the humeral head and contributing to medial rotation.

Variation and clinical relevance

Anatomical variation is possible: some individuals may have multiple tendinous slips or accessory muscular fibers within the subscapularis region. These variations can affect tendon texture, tear patterns, and surgical approach in rotator cuff procedures. Subscapularis pathology can occur alone or as part of broader rotator cuff disorders, presenting with anterior shoulder pain, weakness in internal rotation, or limited shoulder elevation.

Function

The primary actions of the subscapularis include medial (internal) rotation of the arm and stabilization of the humeral head during shoulder movement. It works in concert with the other rotator cuff muscles to maintain glenohumeral joint integrity.

Etymology

The term subscapularis derives from Latin subscapularis, meaning “below the scapula.” The plural form subscapularisas is not standard in English medical nomenclature and is rarely used in formal texts.