What is the insertion of the supraspinatus?

The supraspinatus muscle originates from the supraspinous fossa, which is a concave surface at the top of the scapula. From the supraspinous fossa of the scapula, the supraspinatus muscle then extends laterally (outward) and inserts onto the humerus, which is the long bone that makes up the upper arm.

The supraspinatus tendon is inserted into the superior facet of the greater tubercle of the humerus.

Likewise, what motion does the supraspinatus do? Action. Contraction of the supraspinatus muscle leads to abduction of the arm at the shoulder joint. The supraspinatus also helps to stabilize the shoulder joint by keeping the head of the humerus firmly pressed medially against the glenoid fossa of the scapula.

Likewise, what does the supraspinatus attach to?

The supraspinatus muscle has its origin from the supraspinous fossa of the scapula and inserts into the upper facet of the greater tuberosity of the humerus (Fig. 42-1). The muscle passes across the superior aspect of the shoulder joint with the inferior portion of the tendon intimately involved with the joint capsule.

What is the insertion of the infraspinatus?

Insertion of the Infraspinatus Specifically, the infraspinatus inserts onto a large, round prominence located at the top, outer portion of the humerus. This prominence is called the greater tubercle or greater tuberosity. The infraspinatus muscle inserts onto the greater tubercle of the humerus.

Why is the supraspinatus most commonly injured?

The supraspinatus tendon is the most frequently torn tendon in the shoulder. Tears to the rotator cuff can be caused by an acute injury such as a fall, lifting or pulling, or lifting too much overhead. Chronic tears are more common and are caused by degenerative changes over the years.

Why is my supraspinatus so tight?

Anatomical factors such as the shape of the acromion or a tight subacromial space due to a thickened ligament may be predisposing factors. Tears in the tendon of the supraspinatus or other rotator cuff muscles (commonly occur together) often result from a fall on the shoulder, usually in older people.

Can the supraspinatus be palpated?

It is impossible to palpate with the person in the standard anatomical position because it is under the acromion. In order to access the supraspinatus tendon, it must be brought to the anterior part of the shoulder. This is accomplished by placing the arm behind the back, thus medially rotating the humerus.

How do you test for supraspinatus?

The supraspinatus can be tested by having the patient abduct the shoulders to 90 degrees in forward flexion with the thumbs pointing downward. The patient then attempts to elevate the arms against examiner resistance (Figure 3). This is often referred to as the “empty can” test.

How long does a supraspinatus tear take to heal?

The best results occur when the tear is fresh rather than older tear. Most rotator cuff repairs take approximately six months of rehabilitation to regain as full as possible range of motion, shoulder strength and function.

Does a torn rotator cuff hurt all the time?

Rotator cuff tendon tears often cause pain at night. The pain may even wake you. During the day, the pain is more tolerable, and usually only hurts with certain movements, such as overhead or reaching toward the back. Over time, the symptoms become much worse, and are not relieved by medicines, rest, or exercise.

How big is the supraspinatus tendon?

RESULTS: The mean anteroposterior dimension of the supraspinatus insertion was 25 mm. The mean superior to inferior tendon thickness at the rotator interval was 11.6 mm, 12.1 mm at midtendon, and 12 mm at the posterior edge.

Does supraspinatus do external rotation?

*Supraspinatus assists in external rotation when shoulder is abducted and internal rotation when shoulder is flexed (Ackland DC & Pandy MG, 2011). Supraspinatus is most often injured rotator cuff muscle. The inability to smoothly abduct arm against resistance may indicate rotator cuff injury.

What is the supraspinatus test?

The Empty Can Test, along with the Full Can Test is a commonly used orthopedic examination test for supraspinatus impingement or integrity of the supraspinatus muscle and tendon. The test is usually easier in sitting or standing. On the side to be tested the one of the examiner’s hands stabilizes shoulder girdle.

What causes supraspinatus injury?

A supraspinatus tear can occur in due to a trauma or repeated micro-trauma and present as a partial or full thickness tear. Most of the time the tear occurs in the tendon or as an avulsion from the greater tuberosity.

Is the pectoralis major superficial or deep?

The pectoralis major is the most superficial muscle in the pectoral region. It is large and fan shaped, and is composed of a sternal head and a clavicular head: Sternocostal head – originates from the anterior surface of the sternum, the superior six costal cartilages and the aponeurosis of the external oblique muscle.