The
correct answer is spermatogonia in the seminiferous tubules are located
closest
to the outer edge of the tubule.
Spermatogonia
is an undifferentiated male germ cell which undergoes spermatogenesis. The most
immature germ cells, such as spermatogonia are located near the basement
membrane of the seminiferous tubules and thus have access to factors from the
interstitium.