. Describe the structure of a seminiferous tubule.
Seminiferous tubules are lined by two types of cells, spermatogonia and Sertoli cells
from inside. Spermatogonia cells form sperms through mitotic division, while nutrition
to germ cells is provided by Sertoli cells. The regions outside the seminiferous tubules
called interstitial spaces which contain small blood vessels and Leydig cells, androgens
are secreted from Leydig cells.