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What is the Origin of the Pectoralis Major Muscle? 2 origins; clavicluar head originating from the medial half of the clavicle until the sternoclavicular joint and the sternocostal head; originating from the manubrium, body of sternum and external aponeurotic fascia. upper 6 ribs give costal origins.
Describe the insertion of the Pectoralis Major 3 lamina, superficial, from clavicular head, intermediate from sternal head, deep from costal slips inserts most proximal proximal origins insert distal and viceversa
What is the nerve supply of the Pectorlais Major? Medial (C8, T1) and lateral (C5, C6, C7) pectoral nerves. Medial pectoral nerve pierce pectoralis minor and supplies it before supplying the sternocostal head. the lateral pectoral nerve supplies the clavicular head
What is the function of the Pectoralis Major? with lat dorsi, powerfull adductor, alone, internal rotator of humerus, when arm abducted, accessory muscle of respiration, clavicular head is weak flexor
Created by: sacksyb
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