Sertoli cells are also called

The glans penis is a derivative of . . . . . . .

What is the condition called when the testes fail to descend into the scrotum in mammals?

Which is the primary sex organ in males?

Each testicular lobule contains . . . . . . convoluted seminiferous tubules.

The organs which produce gametes are called $...A...$ and those which neither produce gametes nor hormones are called $...B...$. Here $A$ and $B$ represent: