pectoralis major (muscle)
Definition: superficial thoracoappendicular muscle of chest; origin, clavicular part [TA] (pars clavicularis [TA]), medial half of clavicle; sternocostal part [TA] (pars sternocostalis [TA]), anterior surface of manubrium and body of sternum and cartilages of first to sixth ribs; abdominal part [TA] (pars abdominalis [TA]), aponeurosis of external oblique; insertion, crest of greater tubercle of humerus; action, adducts and medially rotates arm; nerve supply, anterior thoracic.
Synonym(s): musculus pectoralis majorTA, greater pectoral muscle
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