Name
Pronunciation
(in-fruh-spi-NA-t us)
Origin/Proximal Attachment
Infraspinous fossa of the scapula
Insertion/Distal Attachment
Middle facet of the greater tubercle of the humerus, capsule of the shoulder joint
Action/Relevance
Externally rotates the armStabilizes the glenohumeral joint
Innervation
Suprascapular nerve (C5, 6)
Notes
The Infraspinatus muscle is a lateral rotator of the glenohumeral joint.
It attaches medially to the infraspinous fossa of the scapula and laterally to the greater tubercle of the humerus.