Subscapularis is one of the four rotator cuff muscles. The muscle also acts to hold the head of the humerus in position and prevents it moving forwards.

Origin

  • Anterior (costal) surface of the scapula

Insertion

  • Lesser tuberosity of the humerus

Actions

  • Internal rotation
  • Adduction

Innervation

  • Upper and lower subscapular nerves

Daily uses

  • Tucking the back of your shirt into your trousers

How can I stretch it?

  • External shoulder rotation stretch

 

How can I strengthen it?

Internal shoulder rotation with a dumbbell

 

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