Supraspinatus - Muscle Physiology & Functional Anatomy

Supraspinatus Muscle

 

Anatomy

 

Origin:

  • Supraspinous fossa (groove) of (superior) scapula


Insertion:

  • Superior facet of greater tubercle of humerus



Major Artery:

  • Subscapular artery

 

Neural Innervation:

  • Subscapular nerve

 

Trigger Points:

Trigger Points of the Supraspinatus

 

 

Physiology

 

Concentric Functions:

  • Shoulder abduction

 

Eccentric Function:

  • Decelerates adduction of the arm

 

Isometric Function:

  • Assists dynamic stabilization of the humeral head in the glenoid fossa

 

Related Muscles

Antagonists:

Exercises:

 

 


More Images of the Supraspinatus Muscle

 

Supraspinatus

Supraspinatus

 


More Information about the Supraspinatus Muscle

The name for the supraspinatus muscle is derived from the Latin words 'supra' which means above and 'spina' which means spine. The supraspinatus initiates abduction & dynamic caudal glide while the deltoid acts as the prime mover during shoulder abduction.

The supraspinatus is the rotator cuff muscle which is most commonly injured. The inability to smoothly abduct the arm against resistance may demonstrate the presence of a rotator cuff injury.

 

 

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