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3 Cards in this Set

  • Front
  • Back
Pectoralis Major – Front chest muscles over ribs
Origin: clavicle, sternum, costal cartilages 1-6
Insertion: crest inferior to greatest tubercle
Innervation: lateral AND medial pectoral nn.
Action: adduct + medially rotate humerus
Pectoralis Minor – Left smaller muscle over upper ribs
Origin: ribs 3-5
Insertion: coracoid process
Innervation: lateral and medial pectoral nn.
Action: protract shoulder girdle + depress glenoid
Subclavius – small muscle covering the top rib
Origin: 1st rib
Insertion: inferior clavicle
Innervation: n. to subclavius
Action: protract shoulder girdle