Infraspinatus muscle
Musculus infraspinatus
- Synonym: Infraspinous muscle
Definition
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.
References
Text by Antoine Micheau, MD - Copyright IMAIOS
Illustrated Veterinary Anatomical Nomenclature - 3rd edittion - Gheorghe M. Constantinescu, Oskar Schaller - Enke
