Reproductive System of the Dog

Question 1

Identify the external male genital organs.

Answer 1

Testis, Epididymis, Ductus deferens, Extra-pelvic urethra, Penis

Question 2

Identify the internal male genital organs.

Answer 2

Prostate, Ampulla of the ductus deferens

Question 3

Describe the external covering of the testis.

Answer 3

Tunica albuginea, Parietal and visceral vaginal tunics

Question 4

Where do the testes develop and where do they descend to?

Answer 4

Develop within the abdominal cavity, just caudal to the kidneys (retroperitoneal), and descend to the scrotum.

Question 5

What forms the two layers enveloping the testes?

Answer 5

The vaginal process forms the visceral and parietal vaginal tunic.

Question 6

Describe the scrotum.

Answer 6

A pouch of skin carried high between the thighs in the caudal inguinal region, houses and covers the testes, and controls testicular temperature.

Question 7

Enumerate the layers of the scrotum.

Answer 7

Skin, Muscle (tunica dartos), Fascia, Peritoneum

Question 8

What is the function of the tunica dartos?

Answer 8

Contracts the scrotal skin.

Question 9

What is the function of the median septum?

Answer 9

Divides the internal cavity of the scrotum in half.

Question 10

What is the scrotal raphe?

Answer 10

A line extending the full length of the scrotum along the midline.

Question 11

Describe the epididymis.

Answer 11

Convoluted tubular structure that stores maturing and mature sperm.

Question 12

Where is the epididymis positioned?

Answer 12

Slightly applied to the dorsolateral surface of the testis.

Question 13

Enumerate the regions of the epididymis.

Answer 13

Head, Body, Tail

Question 14

Enumerate the ligaments associated with the epididymis.

Answer 14

Ligament of the tail of the epididymis, Proper ligament of the testis

Question 15

Describe the ductus deferens.

Answer 15

Tubular organ that conducts sperm from the tail of the epididymis to the prostatic region of the urethra.

Question 16

Describe the course of the ductus deferens.

Answer 16

Passes from the lateral to medial surface of the caudal testicular pole; passes cranially along the dorsomedial border of the testis; through the inguinal canal into the abdominal cavity; arcs across the lateral surface of the bladder; forms the ampulla of the ductus deferens; pierces and enters the prostate gland; opens into the lumen of the prostatic urethra.

Question 17

Enumerate the components of the spermatic cord.

Answer 17

Testicular artery and vein, Efferent testicular lymphatic vessels, Testicular nerve, Ductus deferens and its associated artery and vein

Question 18

What are the mesenteries associated with the spermatic cord?

Answer 18

Mesoductus deferens, Mesorchium

Question 19

Describe the cremaster muscle.

Answer 19

Elevates the testis in response to cold or sympathetic drive.

Question 20

What is the pampiniform plexus?

Answer 20

Convoluted veins that cool the arterial blood.

Question 21

Describe the penis in dogs.

Answer 21

Musculocavernous penis characterized by cavernous tissue that fills with blood to achieve erection.

Question 22

Enumerate the regions of the penis.

Answer 22

Root, Body, Glans

Question 23

What structures are associated with the cavernous tissue in the penis?

Answer 23

Corpus spongiosum, Bulb of the penis, Corpus cavernosum, Os penis

Question 24

Enumerate the skeletal muscles associated with the penis.

Answer 24

Ischiourethralis, Bulbospongiosus, Ischiocavernosus

Question 25

What smooth muscle is associated with the penis?

Answer 25

Retractor penis muscle

Question 26

Describe the prepuce.

Answer 26

Sheath of skin that houses the penile glans when not erect.

Question 27

Enumerate the structures of the prepuce.

Answer 27

External lamina, Preputial orifice, Internal lamina

Question 28

What is the function of the preputial muscle?

Answer 28

Prevents the prepuce from dangling when the penis is flaccid.

Question 29

Identify the accessory genital organ in male dogs.

Answer 29

Prostate gland

Question 30

What is the function of the prostate gland?

Answer 30

Secretes fluid contributing to the seminal fluid