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- Internal rotation of the arm is a movement of the humerus when an arm flexed to 90° at the elbow is rotated around the longitudinal plane of the humerus such that the hand moves towards the midline of the body1. The degree of rotation is dependent on the degree of abduction at the shoulder. In adduction, internal rotation can be up to 70°1. Subscapularis is a muscle that medially rotates (internal rotation) the humeral head within the glenoid fossa2. The normal range of motion for a healthy shoulder is 70 to 90 degrees3.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Internal (medial) rotation represents the movement of the humerus when an arm flexed to 90° at the elbow is rotated around the longitudinal plane of the humerus such that the hand moves towards the midline of the body. The degree of rotation is dependent on the degree of abduction at the shoulder. In adduction, internal rotation can be up to 70°.radiopaedia.org/articles/movements-of-the-armDue to its unique axis of pull, from the proximal humerus to the costal scapular surface, subscapularis medially rotates (internal rotation) the humeral head within the glenoid fossa. To a lesser extent, subscapularis also adducts the arm. The sequence of these two movements is seen in walking when your arms swing.www.kenhub.com/en/library/anatomy/subscapulari…Imagine your body is a cabinet, your arms are the cabinet doors and you’re shutting the doors. This is medial rotation — also referred to as internal rotation — and the normal range of motion for a healthy shoulder is 70 to 90 degrees.www.healthline.com/health/shoulder-range-of-motion
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