What action does the infraspinatus muscle perform in the shoulder?
Answer (2)
The infraspinatus muscle is one of the four rotator cuff muscles located in the shoulder. Its primary function is to aid in the movement and stabilization of the shoulder joint.
Action: The main action of the infraspinatus muscle is lateral rotation of the arm at the shoulder. This means it helps to rotate the arm outward, away from the body.
Location: The infraspinatus muscle is located on the back of the shoulder blade (scapula). It originates from the infraspinous fossa of the scapula and inserts on the greater tubercle of the humerus (the upper arm bone).
Importance: By facilitating lateral rotation, the infraspinatus muscle helps with various shoulder movements such as reaching back or throwing a ball. It also plays a crucial role in stabilizing the shoulder joint, especially when the arm is elevated.
In summary, the infraspinatus muscle is essential for both movement and stability of the shoulder, enabling a wide range of arm motions.
The infraspinatus muscle is responsible for lateral rotation of the arm at the shoulder, aiding in movements like throwing. It is located on the back of the shoulder blade and plays a crucial role in stabilizing the shoulder joint. Its functions are essential for many everyday actions involving the arms.
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