Muscle Atlas

Pectoralis Major

Origin: Clavicular head: anterior surface of medial half of clavicle; Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle
Insertion: Lateral lip of intertubercular groove of humerus
Action: Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly; Acting alone: clavicular head flexes humerus and sternocostal head extends it
Innervation: Lateral and medial pectoral nerves; clavicular head (C5 and C6, sternocostal head (C7, C8, and T1)
Arterial Supply: pectoral branch of the thoracoacromial trunk

The medical illustrations contained in this online atlas are copyrighted © 1997 by the University of Washington. They may not be utilized, reproduced, stored, or transmitted in any form or by any means, electronic or mechanical, or by any information storage or retrieval system, without permission in writing from the University of Washington.

Receiving a license to use these images is generally quite easy, particularly for academic and scholarly purposes. For more information see the Musculoskeletal Atlas Express Licensing Page.

Back to the Muscle Atlas