Infraspinatus muscle: A muscle that assists the lifting of the arm while turning the arm outward (external rotation).
The tendon of the infraspinatus muscle is one of four tendons that stabilize the shoulder joint and constitute the rotator cuff. Each of the four tendons that makes up the rotator cuff hooks up to a muscle that moves the shoulder in a specific direction. The four muscles whose tendons form the rotator cuff are:
Damage to the rotator cuff is one of the most common causes of shoulder pain.
The term "infraspinatis" means below (infra) the spine. The infraspinatus muscle originates below the "spine" of the scapula (the wingbone).
n. A muscle with origin from the infraspinous fossa of the scapula, with insertion to the great tubercle of the humerus , with nerve supply from the suprascapular ...
An interactive animated tutorial on the infraspinatus muscle, including its attachments, actions, and nerve supply.
Infraspinatus Muscle Location and Trigger Points . The Infraspinatus, one of the rotator cuff muscles, lies on the outside of the lower 2/3 of the ...
ACTION: external rotation of humerus REFERRAL: upper back, anterior shoulder . COMMENTS: This muscle can also refer pain into the vertebral border of the scapula.
Other Names. Rotatory Cuff Back Heads. Infraspinatus Movement. Shoulder. External Rotation; Transverse Abduction; Transverse Extension