Health & Fitness

What movement does the infraspinatus muscle do?

By: Jamal KhoshandamUpdated: April 11, 2021

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In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. As one of the four muscles of the rotator cuff, the main function of the infraspinatus is to externally rotate the humerus and stabilize the shoulder joint.

Furthermore, what is the function of the supraspinatus muscle?

Function. The supraspinatus muscle performs abduction of the arm, and pulls the head of the humerus medially towards the glenoid cavity. Beyond 15 degrees the deltoid muscle becomes increasingly more effective at abducting the arm and becomes the main propagator of this action.

One may also ask, what is the antagonist of the infraspinatus?

The infraspinatus: agonistic: anterior deltoid, latissimus dorsi, lower trapezius, pectoralis major, pectoralis minor, serratus anterior, teres minor. antagonistic: middle deltoid, middle trapezius, posterior deltoid.

How do you heal the infraspinatus?

Infraspinatus injuries are often caused by repetitive motion. Resting your shoulder will give it a chance to heal. A doctor might recommend resting your arm in a sling or temporarily avoiding activities that cause more pain.

What does a torn Infraspinatus feel like?

Infraspinatus tendon tears frequently occur in overhead athletes, as a result of overuse injury, or in chronic shoulder instability. The main complaints are pain while sleeping, weakness in the affected arm, and inability to move the arm in certain motions.

Related

How do you test for Infraspinatus?

Technique The examiner places the patient's arm shoulder in 90 degrees of shoulder flexion with the elbow flexed to 90 degrees and then internally rotates the arm. The test is considered to be positive if the patient experiences pain with internal rotation.

What type of muscle is Infraspinatus?

The infraspinatus is a portion of the rotator cuff muscles that are composed of the supraspinatus, infraspinatus, teres minor, and subscapularis. These muscles act to stabilize the glenohumeral joint.

Where does the infraspinatus attach?

Lesson Summary
The infraspinous fossa is the large, triangular-shaped concave surface located at the back of the scapula. From this location, the infraspinatus muscle travels upward diagonally and inserts onto the greater tubercle of the humerus (long bone of the upper arm).

Where is the infraspinatus tendon located?

The infraspinatus, specifically, acts as an external rotator of the shoulder and is located along the posterior shoulder blade, or scapula. In order to appreciate the effects of this muscle's actions, we need to tie in real life circumstances to make sense of these scientific words.

What movement does the supraspinatus perform?

Function. The supraspinatus muscle performs abduction of the arm, and pulls the head of the humerus medially towards the glenoid cavity.

What joint does the infraspinatus cross?

Infraspinatus is a thick triangular muscle that occupies the majority of the dorsal surface of the scapula.

Infraspinatus muscle.
Origin Infraspinous fossa of scapula
Action Shoulder joint: Arm external rotation; Stabilizes humeral head in glenoid cavity

What nerve innervates the infraspinatus muscle?

The suprascapular nerve provides motor innervation to the supraspinatus and infraspinatus muscles. The nerve winds distally around the head of the scapula and is most susceptible to trauma at this site.

What movement does the subscapularis muscle perform?

Function. The subscapularis rotates the head of the humerus medially (internal rotation) and adducts it; when the arm is raised, it draws the humerus forward and downward. It is a powerful defense to the front of the shoulder-joint, preventing displacement of the head of the humerus.

Is the infraspinatus deep or superficial?

The medial aspect of the infraspinatus fascia is located deep to the trapezius muscle. The lateral aspect of the infraspinatus fascia is largely covered by the posterior belly of the deltoid muscle and the most inferior aspect may sometimes be deep to a portion of the latissimus dorsi muscle.

Where does the infraspinatus muscle originate and insert?

The infraspinatus muscle belongs to the group of the rotator cuff muscles together with the supraspinatus, subscapularis and teres minor muscles. It originates in the infraspinatous fossa of the scapula and inserts on the greater tubercle of the humerus.

What arteries supply the infraspinatus?

The infraspinatus is supplied arterially by the suprascapular and circumflex scapular arteries. The suprascapular artery is either a branch of the thyrocervical trunk or a direct branch of the subclavian artery.

What is the function of teres minor?

The function of this action is to facilitate over-head upper limb movements such as pulling and throwing. Arm external rotation: Working together with infraspinatus, teres minor pulls the greater tubercle posteriorly, resulting in external (lateral) rotation of the arm.

What are the four rotator cuff muscles?

What Is It?
  • Supraspinatus. This holds your humerus in place and keeps your upper arm stable.
  • Infraspinatus. This is the main muscle that lets you rotate and extend your shoulder.
  • Teres Minor. This is the smallest rotator cuff muscle.
  • Subscapularis.

What is bicep Brachii?

The term biceps brachii is a Latin phrase meaning "two-headed [muscle] of the arm", in reference to the fact that the muscle consists of two bundles of muscle, each with its own origin, sharing a common insertion point near the elbow joint.

What movement does the teres minor perform?

Teres Minor, along with Infraspinatus, primarily produces external rotation of the shoulder joint. It assists in adduction and extension of the shoulder.