The testes are formed of numerous tubular
seminiferous tubules. Each seminiferous tubule shows an
orderly arrangement of cells undergoing different phases of
maturation. The peripheral layer of cells next to the basement
membrane is formed of spermatogonia or sperm mother cells
and is often described as germinal epithelium. In between the
group of spermatogonia are tall columnar cells, the Sertoli
cells that provide nourishment to developing sperms.