Pectoralis muscle wikipedia - Search
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  1. Copilot Answer
    Structure

    It arises from the anterior surface of the sternal half of the clavicle from breadth of the half of the anterior surface of the … See more

    Function

    The pectoralis major has four actions which are primarily responsible for movement of the shoulder joint.
    1. The first action is flexion of the humerus, as in throwing a ball underhand, and in lifting a child.… See more

    OriginClavicular head: anterior surface of the medial half of the clavicle. · Sternocostal head: anterior surface of the sternum, the superior six costal cartilages, and the aponeurosis of the external oblique muscle
    InsertionLateral lip of the bicipital groove of the humerus · (anteromedial proximal humerus)
    NerveLateral pectoral nerve and medial pectoral nerve · Clavicular head: C5 and C6 · Sternocostal head: C7, C8 and T1
    Clinical significance

    Tears of the pectoralis major are rare and typically affect otherwise healthy individuals. This type of injury is known to affect the athletic population, namely in high-impact contact sports such as powerlifting… See more

    See also

    Pectoralis minor, an inferior, smaller muscle to the pectoralis major
    Sternalis, an accessory muscle found in some individuals that may have embryonic origin from the pectoralis major… See more

    External links

    Illustration: upper-body/pectoralis-major from The Department of Radiology at the University of Washington
    UCC
    www.polands-syndrome.comSee more

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