The infraspinatus is an intrinsic muscle of the shoulder region. It is part of the rotator cuff muscle group. Attachments: Originates from the infraspinous fossa of the scapula and attaches to the greater tubercle of the humerus. Innervation: Suprascapular nerve. Actions: Lateral rotation of the upper limb at the shoulder. Blood supply: Suprascapular and circumflex scapular arteries By TeachMeSeries Ltd (2025) Fig 1The rotator cuff muscles, which act to stabilise the shoulder joint. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article