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Muscle Origin Insertion Action Nerve
intercostal external inferior border of ribs superior border of ribs elevation of ribs; fix intercostal spaces during respiration intercostal nerves
intercostal innermost interior inferior border of ribs above interior superior border of ribs below depression of ribs during expiration; fix intercostal spaces during espiration intercostal nerves
intercostal internal inferior border of ribs superior border of ribs below depression of ribs during expiration; fix intercostal spaces during espiration intercostal nerves
levatores costarum TP C7 to T11 brevis: posterior surface & angle of 1 rib below; longus: posterior surface & angle of 2 ribs below elevates ribs spinal dorsal rami
subcostalis internal surface ribs #10-12 internal surfaceof ribs #8-10 depression ribs #10-12 intercostal nerves
transversus thoracis inferior 1/3 of inner aspect of sternum, xyphoid process & costosternal junctions of ribs #4-7 costal cartilage of ribs #2-6 depresses upper ribs intercostal nerves

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