Muscle
Infraspinatus
Rotator cuff — lateral rotation
High-yield
Chief lateral rotator of the arm; suprascapular nerve (shared with supraspinatus).
Overview
A rotator cuff muscle filling the infraspinous fossa that laterally rotates the arm and resists posterior dislocation.
Reference facts
- Origin
Infraspinous fossa of the scapula
- Insertion
Middle facet of the greater tubercle of the humerus
- Action
Laterally rotates the arm; stabilises the glenohumeral joint
- Innervation
Suprascapular nerve (C5, C6)
- Blood supply
Suprascapular and circumflex scapular arteries