Uberon definition : the respiratory muscles that arise from the lower border of one rib and insert into
the upper border of the adjoining rib;
Uberon related term : intercostales; rib muscle; respiratory muscle;
Uberon Homology note : Inspiration by active expansion of the thorax evolved later, in the ancestor of reptiles,
birds, and mammals. This was powered originally by the intercostal muscles (as in
lizards or crocodilians) and later (in mammals only) by a muscular diaphragm.[well
established][VHOG];