Male genital system-Week 8, Anatomy

Question 1

How many layers of muscle does scrotum have? List them.

Answer 1

• 2
• Dartos muscle: Wrinkles the scrotum when cold
• Cremaster muscle: Pulls the testis up when cold. They keep the testis near the abdomen or away from the abdomen depending on the temperature.

Question 2

What is the function of testicular vessels in scrotum?

Answer 2

-Artery brings warm blood to the testis.

Vein takes warm blood away from the testis

Question 3

What are the factors affecting temperature regulation of testis?

Answer 3

• 2 muscles
• Testicular vessels
• Scrotum is rich in sweat glands(effective cooling)
• Scrotal skin has no fat( no insulation)

Question 4

List the blood supply if male genital organs.

Answer 4

• Testicular artery
• Pampiniform plexus of the veins
• Left testicular vein
• Right testicular vein

Question 5

Testicular artery

Answer 5

From abdominal aorta

Question 6

Pampiniform plexus of veins

Answer 6

Forms the testicular vein

Question 7

Left testicular vein

Answer 7

Ends in the left renal vein

Question 8

Right testicular vein

Answer 8

ends in the inferior vena cava

Question 9

What is a varicocele?

Answer 9

Varicose veins inside the scrotum dilated torturously. —Dilatation and varicosity of the pampiniform venous plexus.
-Most common on the left side.

Question 10

What is the danger of varicocele?

Answer 10

It increases the temperature which causes infertility.

Question 11

What are the 2 types of lymph drainage?

Answer 11

• Testis: drains to the para-aortic lymph node.

- Scrotum: drains to the superficial inguinal lymph nodes.

Question 12

What is the hormonal control of the testis?

Answer 12

-LH stimulate Leydig cells to secrete testosterone.
-Testosterone, stimulates spermatogenesis.
-FSH, initiation of spermatogenesis, it increases the production of the sperms by preventing degeneration of spermatogonia.
Inhibin, inhibits overproduction of the sperms.

Question 13

What are the 5 substances that Sertoli cells secrete?

Answer 13

• Testicular fluid, for nutrition
• Substances to initiate meiosis
• Androgen- binding protein, concentrates testosterone around developing sperms.
• Inhibin hormone, inhibits the release of FSH to prevent overproduction of sperms.
• Mullerian inhibiting hormone, inhibits the development of the female genital duct.

Question 14

List the sexual development of the testis.

Answer 14

• Testicular enlargement, 1st physical manifestation of puberty.
• Seminiferous tubules, remains uncanalised till puberty.
• Canalization occurs at puberty.

Question 15

How long are sperms stored in the epididymis?

Answer 15

3-4 weeks then die if ejaculated doesn’t occur.

Question 16

What is the arterial supply of seminal vesicle?

Answer 16

• Inferior vesicle artery

- Middle rectal artery

Question 17

Where is the origin of prostate gland?

Answer 17

• Below the neck of the urinary bladder.
• Above, the urogenital diaphragm.
• Behind the lower part of the symphysis pubis.
• In front of the lower 1/3 of the rectum

Question 18

What is the base of the prostate glands?

Answer 18

-Pierced by the urethra and ejaculatory ducts.

Question 19

What is the posterior surface of the prostate glands?

Answer 19

the lower third of the rectum

Question 20

What are the sides of the prostate glands?

Answer 20

Levator ani muscle(levator prostate)