The narrow middle part of the epididymis is called:

Match the following columns:

Column-$I$	Column-$II$
$(1)$ Seminal vesicle	$(a)$ Gland contributing $70\%$ of semen
$(2)$ Prostate	$(b)$ Male accessory reproductive organ
$(3)$ Mammary gland	$(c)$ Male accessory reproductive gland
$(4)$ Penis	$(d)$ Gland differentiating during pregnancy

Two major entities seen in human testis $TS$ are

How many testicular lobules are present in each testis?

Given below are two statements:
Statement-$I$: The scrotum helps in maintaining the low temperature of the testes.
Statement-$II$: Low temperature,compared to the normal internal body temperature,is necessary for spermatogenesis.
In the light of the above statements,choose the most appropriate answer from the options given below.

Identify the correct label and its function based on the provided diagram of the human male reproductive system.