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Infraspinatus

Region

Origin & Insertion

['Origin: Infraspinous fossa of scapula', 'Insertion: Middle facet of greater tubercle of humerus']

Synergistic Muscles

['Teres minor', 'Posterior deltoid']

Joints

['Glenohumeral joint']

Primary Actions

['External rotation of shoulder']

Nerve & Spinal Segment

Suprascapular nerve

Brachial plexus; C5–C6

Interesting

Key stabilizer during shoulder external rotation. [Clinically Oriented Anatomy]

Reversal of Action

Thoracic rotation initiated from shoulder

Common Dysfunctions

Weak external rotation, rotator cuff syndrome

How to Stretch

Cross arm stretch with humeral internal rotation.

Trigger Points

How to Strengthen

Theraband or dumbbell ER.

Concentric Action

External rotation of humerus

Applications:

Key in shoulder stability, injury prevention during overhead activities

Eccentric Action

Control internal rotation of shoulder

Isotonic Action

External rotation with band or dumbbell

Related Conditions

['Rotator cuff syndrome', 'Posterior shoulder pain']

Isometric Action

Hold external rotation against resistance

Exercise Ideas

['ER at 90°', 'Side-lying ER', 'Cable ER pulls']

Related Blogs

Images

Videos

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