A 19 year old complains of pain whilst hunching his left shoulder. Which of the following muscles is the chief protractor of scapula?
Serratus anterior along with petoralis minor is the chief protractor of scapula (helps in advancement of scapula to anterior position on the thoracic cage). Upper fibers of serratus anterior inseed onto the superior angle of scapula stabilize the scapula during initial stages of shoulder abduction.Middle fibers that inse onto the veebral border of scapula are impoant in protraction of scapula.Lower fibers inse onto the inferior angle of scapula and act mostly as an upward rotator of the scapula during abduction.
Serratus anterior
Rhomboidis major
Deltoid
Pectoralis major