On which bones do the four rotator cuff muscles originate and insert?

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Identify the four rotator cuff muscles: supraspinatus, infraspinatus, teres minor, and subscapularis.

Determine the origin of each muscle, which is the bone surface where the muscle begins. For the rotator cuff muscles, these origins are on the scapula:

- Supraspinatus originates from the supraspinous fossa of the scapula.

- Infraspinatus originates from the infraspinous fossa of the scapula.

- Teres minor originates from the lateral border of the scapula.

- Subscapularis originates from the subscapular fossa of the scapula.

Determine the insertion of each muscle, which is the bone surface where the muscle attaches and exerts force. All four rotator cuff muscles insert on the humerus:

- Supraspinatus inserts on the greater tubercle of the humerus.

- Infraspinatus inserts on the greater tubercle of the humerus.

- Teres minor inserts on the greater tubercle of the humerus.

- Subscapularis inserts on the lesser tubercle of the humerus.

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주요 개념

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Rotator Cuff Muscles

The rotator cuff is a group of four muscles—supraspinatus, infraspinatus, teres minor, and subscapularis—that stabilize the shoulder joint. Each muscle has a specific origin and insertion point on the bones around the shoulder, enabling movement and joint stability.

Bone Anatomy of the Shoulder

Key bones involved in the rotator cuff include the scapula (shoulder blade) and the humerus (upper arm bone). The scapula provides the origin points for the muscles, while the humerus serves as the insertion site, allowing muscle contractions to move the arm.

Muscle Origin and Insertion

Origin refers to the fixed attachment point of a muscle, usually on a bone that remains stationary during movement. Insertion is the movable attachment point on a different bone. Understanding these points is essential to know how muscles produce movement at joints.