Mention the location and structure of testes and explain about seminiferous tubules.

The male reproductive system is located in the pelvis region.

It includes a pair of testes along with accessory ducts, glands and the external genitalia.

Testes : The testes are situated outside the abdominal cavity within a pouch called scrotum. The development of testes begin when it is in abdominal cavity. Then they come down to scrotum.

The scrotum helps in maintaining the low temperature of the testes $\left(2-2.5^{\circ} \mathrm{C}\right.$ lower than the normal internal temperature) necessary for spermatogenesis.

In adults, each testis is oval in shape with a length of about $4$ to $5 \mathrm{~cm}$ and a width of about $2$ to $ 3$  $\mathrm{cm} .$