Where are the Leydig cells present?

The prostatic fluid forms about . . . . . . of the total volume of semen. (in $\%$)

Development of epididymis,vas deferens,seminal vesicles,prostate glands and urethra is controlled by

The testis is connected to the abdominal cavity by which of the following?

$A$ pair of bulbourethral glands, also called $...A...$ glands, are present on either side of the $...B...$. They secrete $...C...$ fluid and $...D...$ for lubricating the penis. Here $A, B, C$, and $D$ are:

Label $A, B, C, D$ in the following diagram of the male reproductive system.