Abdomen muscles

o = superior surface of pubis near symphysis

i = inferor surfaces of costal cartilages and xiphoid process

a = depresses ribs, flexes vertebral column

o = external surfaces of lower 8 ribs

i = linea alba, exterior half of iliac crest

a = compresses abdominopelvic cavity, flixing and rotating vertebral column

o = iliac cres, lumbodorsal ligament

i = linea alba, pubic crest, lower 4 ribs

a = compresses abdomino pelvic cavity, assists in flexing and rotating vertebral column

o = iliac crest, costal cartilage of lower 6 ribs

i = linea alba and pubic crest

a = compresses abdominopelvic cavity

o = xipoid process

i = central tendon of diaphragm

a = increases volume of thoracic cavity