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) | 
