Epididymis: head

At the junction of the testis with the epididymis, there is an abrupt transition between the simple cuboidal epithelium of the rete testis and the taller epithelium of the efferent ductules. 200x

At the junction of the testis with the epididymis, there is an abrupt transition between the simple cuboidal epithelium of the rete testis and the taller epithelium of the efferent ductules. 200x

The rete testis and efferent ductules develop from different embryologic structures that join end-to-end during development, producing the abrupt junction indicated by the arrows.