The male reproductive system consists of several components that work together to produce and deliver sperm. Let`s dissect each option to understand which one is not a part of the male reproductive system.

Option 1: Cervix.

The cervix is not a component of the male reproductive system. It is a part of the female reproductive system and is located at the lower end of the uterus, forming the passage between the uterus and the vagina.

Option 2: Urethra.

The urethra is a component of the male reproductive system. It is a tube that extends from the bladder to the tip of the penis and serves as a pathway for both urine and semen to exit the body.

Option 3: Seminal vesicle.

The seminal vesicle is a component of the male reproductive system. It is responsible for producing and storing a fluid called seminal fluid, which mixes with sperm to form semen.

Option 4: Vas deferens.

The vas deferens is a component of the male reproductive system. It is a long tube that carries sperm from the testes to the urethra, where it can be ejaculated during sexual activity.

In summary, the correct answer is option 1. The cervix is not a part of the male reproductive system.