Infraspinatus - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x 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 (2026) 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 Frequent questions What is the infraspinatus muscle? The infraspinatus is an intrinsic muscle located in the shoulder region and is one of the four muscles that comprise the rotator cuff. It plays a crucial role in stabilising the shoulder joint. Where does the infraspinatus muscle originate and insert? The infraspinatus originates from the infraspinous fossa of the scapula and inserts onto the greater tubercle of the humerus. This anatomical positioning allows it to effectively perform its functions. What is the primary action of the infraspinatus? The main action of the infraspinatus muscle is the lateral rotation of the upper limb at the shoulder. This movement is essential for various overhead activities and arm positioning. Which nerve innervates the infraspinatus muscle? The infraspinatus is innervated by the suprascapular nerve. This nerve is responsible for providing the necessary motor function to the muscle. What is the blood supply for the infraspinatus muscle? The infraspinatus muscle receives its blood supply from the suprascapular and circumflex scapular arteries. These vessels ensure adequate oxygenation and nutrient delivery to support muscle function. Rate This Article