Does the Supraspinatus rotate?

When it was in external rotation, external rotation occurred. These results indicate that the bi-directional rotating function of the supraspinatus muscle is characterized by an anatomical relationship between the running direction of the supraspinatus muscle and the center of rotation of the humeral head.

Which rotator cuff muscle is the only muscle not involved with shoulder rotation?

The teres major muscle has its origin on the scapula, like the rotator cuff muscles, but is not involved in rotating the arm.

What is the function of the Supraspinatus?

The supraspinatus muscle functions to initiate abduction and depress the humeral head against the upward pull of the deltoid. The muscle and tendon travel slightly obliquely from posterior to anterior, allowing it to contribute to external rotation as well.

Does the Supraspinatus abduct?

Conclusions: Supraspinatus is recruited prior to movement of the humerus into abduction but not earlier than many other shoulder muscles, including infraspinatus, deltoid and axioscapular muscles. The common statement that supraspinatus initiates abduction is therefore, misleading.

Does the supraspinatus rotate the shoulder?

The supraspinatus is arguably the most important rotator cuff muscle for providing dynamic stability of the humeral head during overhead activities. The supraspinatus muscle compresses, abducts, and generates a small external rotation torque on the glenohumeral joint.

Is supraspinatus an external rotator?

The supraspinatus muscle is responsible for initiating abduction, the infraspinatus and teres minor for controlling external rotation, and the subscapularis for controlling internal rotation.

Is supraspinatus a rotator cuff muscle?

The rotator cuff contains four muscles: Supraspinatus controls internal rotation and lifting of the arm. Infraspinatus allows you to externally rotate your arm in the shoulder socket. Teres minor is a small muscle that helps rotate your arm.

Why is the supraspinatus most commonly injured?

The supraspinatus tendon is the most commonly injured tendon of the four tendons because it lies predominantly in the space between the acromion and the humeral head.

Is the supraspinatus a muscle?

The supraspinatus muscle, the most superiorly located of the rotator cuff muscles, resides in the supraspinous fossa of the scapula, superior to the scapular spine.

What muscles are involved in abduction of the shoulder?

The primary muscles involved in the action of arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior.

What are the movements of the supraspinatus?

Function. The supraspinatus muscle performs abduction of the arm, and pulls the head of the humerus medially towards the glenoid cavity. It independently prevents the head of the humerus to slip inferiorly.

What is the supraspinatus muscle?

The supraspinatus muscle is one of the four rotator cuff muscles and the one most susceptible to injury. When someone tells me they are having a shoulder problem I ask, “Does it hurt to put your jacket on?” If the answer is yes, the overwhelming odds are that the injury is to the supraspinatus muscle and/or tendon.

Why are supraspinatus tendons so vulnerable to injury?

The tendons of these muscles act like ligaments in a way that no other muscle in the body does, and as a result makes them more vulnerable to injury. The supraspinatus muscle follows the top of the shoulder blade attaching to the top of the humerus, the arm bone.

Is supraspinatus instrumental in shoulder abduction?

Supraspinatus is commonly thought to be instrumental in the initiation of shoulder abduction.

Can the supraspinatus muscle atrophy be improved postoperatively?

Conclusions The supraspinatus muscle atrophy as measured by occupation ratio could be improved postoperatively in case of successful cuff repair. Keywords: Atrophy, Occupation ratio, Postoperative change, Rotator cuff