Infraspinous muscle - Musculus infraspinatus

Anatomical hierarchy

General terms > Myology > Muscles of thoracic limb > Infraspinous muscle



The infraspinatus muscle occupies the infraspinous fossa, and crosses the lateral part of shoulder joint ot the roughened area of the greater tubercle of humerus. It acts as a lateral collateral ligament of the shoulder joint.

Origin: Infraspinous fossa, scapular spine and the caudal border of the scapula.

Insertion: Distal to the greater tubercle of the humerus.

Action: Outward rotator and abductor of the humerus and a flexor or extensor of the shoulder joint, depending on the position of the joint when the muscle contracts.

Nerve: Suprascapularis.

Text by Antoine Micheau, MD - Copyright IMAIOS
Illustrated Veterinary Anatomical Nomenclature - 3rd edittion - Gheorghe M. Constantinescu, Oskar Schaller - Enke


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