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Human Anatomy: Muscle Groups


Human Anatomy



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Muscle Function & Other Pertinent Medical Information
- PECTORALIS MAJOR -
ORIGIN: Clavicular head-medial half clavicle. Sternocostal head-lateral manubrium and sternum, six upper costal cartilages and external oblique aponeurosis
INSERTION: Lateral lip of bicipital groove of humerus and anterior lip of deltoid tuberosity
ACTION: Clavicular head:flexes and adducts arm. Sternal head: adducts and medially rotates arm . Accessory for inspiration
NERVE: Medial pectoral nerve (from medial cord) and lateral pectoral nerve (from lateral cord) (C6, 7, 8)













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