True about pectoralis major muscle
PECTORALIS MAJOR:-Origin: Small clavicular head- medial half of anterior aspect of clavicle.Sternocostal head- lateral half of sternum upto 6th cailage., and medial pas of 2nd to 6th costal cailages.Inseion:-U shaped inseion into lateral lip of bicipital groove.Nerve supply:-Lateral pectoral( C5-C7)Medial pectoral (C6-C8, T1)Action:-Clavicular head- flexes arm Sternocostal head-adducts and medially rotates armOnly muscle of upper limb which is supplied by all 5 spinal segments that form brachial plexus.Blood supply:- pectoral branch of thoracoacromial aery{Reference: Vishram Singh, pg no.40}
Abductor & Internal rotator of shoulder
Blood supply by perforating branch of internal thoracic aery
Blood supply by thoraco acromial aery
Nerve supply by intercostal aery
Upper limb