WebFeb 10, 2024 · The pectoralis major is composed mainly of two parts- the clavicular head and the sternocostal head. • The clavicular head originates from the anterior portion of the medial half of the clavicle. • The sternocostal head originates from the anterior portion of the sternum, the six upper costal cartilages (1-6) and the external oblique aponeurosis. The pectoralis major has four actions which are primarily responsible for movement of the shoulder joint. The first action is flexion of the humerus, as in throwing a ball underhand, and in lifting a child. Secondly, it adducts the humerus, as when flapping the arms. Thirdly, it rotates the humerus medially, as occurs when arm-wrestling. Fourthly the pectoralis major is also responsible f…
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Web20 hours ago · The pectoralis major is divided into two parts: the clavicular head (upper part) and the sternal head (lower part). Pectoralis minor: This muscle is located underneath the pectoralis major and is responsible for pulling the shoulder blade forward and downward. There are also several smaller muscles in the chest, including: WebAug 8, 2024 · The pectoralis major is a broad, fan-shaped muscle that covers this upper anterior portion of this chest. The innervates corresponds to the lateral (C5-C7) and medial (C8-T1) pectoral nerves. It is composed of two body: an sternal head and a clavicular head. The origin of the sternal head is the sternum and the six superior costal cartilages. cyber security salary massachusetts
Pectoralis Major: Functional Anatomy Guide - King of …
WebSep 23, 2024 · Pectoralis Major Origin and Insertion. The Pectoralis Major origins stem from the collar bone, breast bone and the ribs located on the chest. Which then converge … WebOct 7, 2024 · The pectoralis major is a muscle of the anterior chest wall. It is a large fan-shaped muscle, which is composed of a sternal head and a clavicular head. Attachments: Clavicular head originates from the anterior surface of the medial clavicle. WebOct 7, 2024 · The pectoralis major is a muscle of the anterior chest wall. It is a large fan-shaped muscle, which is composed of a sternal head and a clavicular head. … cheap sports cars in pakistan