three cross sections models in the development of the frog
A set of three cross sections in the development of the frog. The basic structures that consist from ecto-, mesio and endodermal cells and grown out to Skin, Muscles, the neural tube, skeleton and muscles. The three cross sections are Sagital-, Frontal- and Transversaal section. Probably made by Somso in the 1940 and in perfect condition.