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