Where does the vas deferens originate from?

What are the width and length of the testis,respectively?

How much lower temperature does the scrotum provide for spermatogenesis compared to the normal body temperature?

The region outside the seminiferous tubules which contains small blood vessels,Leydig cells,and other immunologically competent cells is called $:-$

Which gland contributes the most to the formation of semen?

The cells of $Leydig$ produce and secrete .......... .