Male Reproductive System

Question 1

Fertilisation can happen ___________ or ___________.

Answer 1

• Internally
• Externally

Question 2

Suggest three points regarding external fertilisation.

Answer 2

• Lots of eggs
• Many eggs unfertilised
• Small number survive

Question 3

Suggest three points regarding internal fertilisation.

Answer 3

• Fewer eggs
• More eggs fertilised
• Higher chance of survival

Question 4

List the 7 key structures of the male reproductive system.

Answer 4

• Testis
• Epididymis
• Vas deferens
• Urethra
• Penis
• Prepuce
• Accessory glands (prostate, bulbourethral)

Question 5

What is the function of the testis?

Answer 5

• Produce spermatozoa by spermatogenesis
• Produce fluid to transport sperm from testes to female
• Secrete testosterone

Question 6

Define: Cryptorchid

Answer 6

Where one testicle is retained

Question 7

Define: Bilateral Cryptorchid

Answer 7

Where both testicles are retained.

Question 8

Why are the testis outside of the body?

Answer 8

This is because spermatogenesis requires a cooler environment.

Question 9

What moves the position of the testis during the fluctuation of temperature?

Answer 9

The Dartos Muscle

Question 10

Define: Neoplasia

Answer 10

Cancer

Question 11

Testicular Tissues consist of:

Answer 11

Seminiferous Tubules

Question 12

What are seminiferous tubules lined with?

Answer 12

• Spermatogenic cells
• Sertoli cells

Question 13

The Laydig and Interstitial Cells secrete _______?

Answer 13

Testosterone

Question 14

Describe the location of the Epididymis from the testis.

Answer 14

Dorsolateral

Question 15

What is the main purpose of the epididymis?

Answer 15

Storage and maturation of spermatozoa

Question 16

Name the blood supply for the testis.

Answer 16

Testicular artery

Question 17

The testicular artery divides to form the _____________ _____________.

Answer 17

Pampiniform Plexus (capillary network)

Question 18

Describe the structure of the vas deferens.

Answer 18

Thick smooth muscle walls, connecting to the urethra.

Question 19

What surrounds the point where vas deferens joins the urethra?

Answer 19

The prostate gland

Question 20

Describe the function of the penis.

Answer 20

Conveys sperm and fluid from the testis into the female, as well as conveying urine from the bladder.

Question 21

Describe the structure of the penis.

Answer 21

Composed of muscle, erectile tissue, and connective tissue.
It has a large blood supply and many sensory nerve endings.

Question 22

Describe the canine penis.

Answer 22

The canine penis consists of the bulbus glandis, which engorges with blood. It remains in place as a result of the cingulum contractions in the vagina.

Question 23

Describe the feline penis.

Answer 23

The feline penis consists of barbs, which allow for induced ovulation in the female.

Question 24

What are the two parts of the urethra and their location.

Answer 24

• Pelvic portion - entry point of the vas deferens.
• Penile portion - runs down the length of the penis.

Question 25

What are the two accessory glands?

Answer 25

• Prostate gland
• Bulbouretheral gland

Question 26

Define: Spermatogenesis

Answer 26

• Production of male sex cells
• Once sperm is developed, they are carried to the epididymis for storage prior to ejaculation.

Question 27

What are the three components of Spermatozoon?

Answer 27

• Head - contains the nucleus
• Mid-Piece - large concentration of mitochondria
• Tail - contains muscle-like contractile fibrils.