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sternum pectoralis major origin humerus pectoralis major insertion adducts forelimb pectoralis major action sternum pectoralis minor origin humerus pectoralis minor insertion adducts and retracts forelimb pectoralis minor action pubic bone rectus abdominis origin costal cartilages, sternum rectus abdominis insertion compresses abdominal wall to support organs, flexes trunk rectus abdominis action posterior surface of ribs, lumbodorsal fascia external oblique origin linea alba external oblique insertion compresses abdominal wall to support organs, flexes trunk external oblique action posterior ribs, lumbodorsal fascia internal oblique origin linea alba internal oblique insertion compresses abdominal wall to support organs, flexes trunk internal oblique action posterior ribs, lumbodorsal fascia, lumbar vertebrae transversus abdominus origin linea alba transversus abdominus insertion compresses abdominal wall to support organs, flexes trunk transversus abdominus action dorsal surface of neck, occipital bone clavotrapezius origin clavicle clavotrapezius insertion moves pectoral girdle anteriorly clavotrapezius action spinous processes of cervical and thoracic vertebrae acromiotrapezius origin scapula acromiotrapezius insertion moves scapula medially acromiotrapezius action spinous process of cervical and thoracic vertebrae spinotrapezius origin scapula spinotrapezius insertion moves scapula medially and posteriorly spinotrapezius action