Describe the structure of a seminiferous tubule

Each testicular lobule contains 1-3 highly coiled seminiferous tubules. Each tubule is lined on its inside by two types of cells. The cuboidal cells are called male germ (spermatogenic) cells and few large pyramidal (supporting cells-Sertoli or Nurse cells).
The former gives rise to sperms while the latter provide nutrition to the germ cells.