Leydig cells are found in

Two major entities seen in human testis $TS$ are

Assertion $(A) :-$ Sperm production occurs in the seminiferous tubules.
Reason $(R) :-$ The seminiferous tubules are lined on their inside by spermatogonia and Sertoli cells.

The male sex accessory ducts include,

What happens when the $vas$ $deferens$ is cut in humans?

In most of the mammals,the testes are situated outside the abdominal cavity because