Let's analyze the diagram of the seminiferous tubule step by step:
Spermatogonia: These are the diploid germ cells located at the basal region of the seminiferous tubule (near the basement membrane). In the diagram, label F shows the cells at the base. These are spermatogonia.
Sertoli cells: These are large, elongated, supporting cells that extend from the basement membrane to the lumen, providing nourishment and support to developing sperm. In the diagram, label E represents the Sertoli cell.
Thus, spermatogonium F, Sertoli cell E