Skip to content

Infraspinatus

Contents

Anatomy pictures

Infraspinatus - posterior
Infraspinatus - posterolateral
Infraspinatus - lateral

Referred pain pattern

Muscle type

  • Postural
    • Shortens when overactivated

Symptoms

  • Pain sleeping on affected shoulder
  • Problems scratching back, problems using hand on the back while medially rotating the shoulder

Muscle attachment zones

Videos

Short version

Detailed version

Synergists

Lateral rotation

  • Posterior Deltoideus
  • Teres Minor

Antagonists

Medial rotation

  • Anterior Deltoideus
  • Pectoralis Major
  • Latissimus Dorsi
  • Teres Major
  • Subscapularis

Anatomy

Position

  • Superficial

Origin

  • Fossa infraspinata scapula

Insertion

  • Tuberculum majus humerus (middle facet)

Main function

  • Shoulder
    • Lateral rotation

Nerve innervation

  • Segmenta:
    • C5-C6
  • Peripheral
    • Nervus suprascapularis

Arterial supply

  • Suprascapular artery
  • Scapular artery