Subscapularis – Last of the Rotator Cuff Muscles

 

The subscapularis is the last of the four muscles that make up the rotator cuff group and is the most powerful of the four. We have already covered the other three muscle in this group, the supraspinatus, infraspinatus, and the teres minor in previous posts.

What does Subscapularis mean?

The name of this muscle describes the location of this muscle. Sub meaning under and scapular meaning spade (which refers to the shape of the scapula) describe the location of this muscle: on the underside of the scapula.

Where does Subscapularis attach?

The muscle itself originates on the subscapular fossa of the scapula (shoulder blade).

Its insertion or humeral attachment is on the lesser (smaller) tuberosity (bump) on the front of the humerus.

What actions does Subscapularis do?

Subscapularis internally rotates the humerus.

What are the most common injuries to Subscapularis?

Subscapularis is less likely to be injured than the other rotator cuff muscles. A subscapularis tear is most likely to occur due to a traumatic event such as a fall, accident, when a rapid, strenuous movement is done without warming up, or when there weakness in the muscle after surgery.

• Pain at the front of the shoulder
• Feeling of weakness in the shoulder when twisting the arm inwards or lifting the arm across the front of the body

What to do?

Like tears of the other rotator cuff muscles, subscapularis tears can range from a minor strain requiring rest and possibly physical therapy exercises to a major tear requiring surgery. If you are concerned about a tear or any of the rotator cuff muscles, consult a medical professional for diagnosis and appropriate treatment.

Trigger Points

Trigger Points are fairly common amongst all of the rotator cuff muscles for yoga practitioners. Check the image below and you can read more about what trigger points are here.

Postures Where The Subscapularis Contracts

Hands in reverse prayer require internal rotation at the shoulder joint which is a function of this muscle.

Postures Where The Subscapularis is Lengthened

While externally rotating the arms in Eagle Pose you would lenthen the subscapuluaris

Additional Images of Subscapularis

Trigger Points from the Subscapularis refer to the back of the arm.