Male anatomy

Question 1

Label the anatomy of the male reproductive tract

Answer 1

Question 2

What is the role of the testis?

Answer 2

Sperm production
Endocrine gland - testosterone production

Question 3

Describe the location of the testis

Answer 3

in an evagination of the peritoneum (vaginal tunic)

Question 4

Label this diagram of the testis

Answer 4

Question 5

What is the function of the tunica albuginea?

Answer 5

Sends in finger like projections into parenchyma of the testis
has contractile abilities
role in sperm release

Question 6

What is the fluid in the vaginal cavity of the testis?

Answer 6

Vaginal cavity is continuous with peritoneum
Peritoneal fluid

Question 7

Describe the components of the scrotum

Answer 7

Question 8

Label the histology of the testis

Answer 8

Question 9

What is the function of Leydig cells?

Answer 9

Produce testosterone

Question 10

Describe the anatomy of the seminiferous tubules

Answer 10

Question 11

What is the function of the epididymis?

Answer 11

One long convoluted tubule
Head and body - transport and maturation of spermatazoa (resorption of fluid and secretion of proteins)
Tail - storage of mature spermatazoa, smooth muscle contracts during sexual stimulation to move spermatozoa into ductus deferens

Question 12

What is the function of the ductus deferens?

Answer 12

transports sperm up to pelvic urethra from tail of epididymis

Question 13

What adaptation of the ductus deferens aids its function?

Answer 13

very strong smooth muscle wall aids propulsion of spermatozoa

Question 14

Label the male reproductive tract

Answer 14

Question 15

Label the superficial layer of canine abdominal muscles

Answer 15

Question 16

What is the anatomy and function of the cremaster muscle?

Answer 16

Crescent shaped
Used for elevating testis

Question 17

Label the spermatic cord

Answer 17

Question 18

Describe the function of the pampiniform plexus

Answer 18

• no difference in systolic and diastolic pressure
• heat exchange
• testosterone transfer from testicular vain to artery -> high local conc in testis

Question 19

Which muscles aid temp regulation in the testis?

Answer 19

Tunica dartos (smooth muscle in scrotal skin) - long lasting contraction, brings testes into a warm surrounding
Cremaster muscle (striated muscle in spermatic cord) - short term elevation of testes

Question 20

What are the testicular arteries and veins?

Answer 20

Question 21

Label the vascular supply to the testes

Answer 21

Question 22

Which nerve provides innervation of the penis?

Answer 22

Terminal branch of pudendal nerve

Question 23

Which artery supplies the accessory glands, urethra and penis?

Answer 23

Internal pudendal artery

Question 24

What is the function of the male accessory reproductive glands?

Answer 24

Produce seminal plasma

Question 25

What are the male accessory reproductive glands?

Answer 25

Ampulla Vesicular gland Prostate gland Bulbourethral gland

Question 26

Label the accessory glands (and other relevant structures) of the stallion

Answer 26

Question 27

What is the colliculus seminalis?

Answer 27

Question 28

Label the accessory glands and relevant structures of the bull

Answer 28

Question 29

Label the accessory glands and relevant structures of the boar(ignore middle)

Answer 29

Question 30

Label the accessory glands and relevant structures of the dog

Answer 30

Question 31

Fill in the table of the presence of reproductive accessory glands in different species

Answer 31

Question 32

What is the unique anatomy of the canine prostate gland?

Answer 32

bilobed

Question 33

What is benign prostatic hyperplasia in the dog?

Answer 33

overgrowth of prostrate ->compression of the rectum -> tenesmus (straining even if don't need to poo)

Question 34

What are the common muscles of the male reproductive tract and their locations, anatomy and function?

Answer 34

Urethralis muscle - surrounds the pelvic urethra Bulbospongiosus muscle - surrounds the bulbourethral glands and penile urethra Both striated and important for transport of semen through the urethra

Question 35

What is the anatomy, location and function of the ischiocavernosus muscle?

Answer 35

Striated Encloses crura penis Important for erection

Question 36

Where is the crura/root of the penis attached?

Answer 36

Paired attached to ischiatic arch

Question 37

Describe the 3 columns of erectile tissue

Answer 37

2x corpus cavernosum - basis of the crura - surrounded by dense connective tissue (tunica albuginea) Corpus spongiosum - around urethra

Question 38

Label the erectile tissue of the penis

Answer 38

Question 38

What are the 2 types of penis?

Answer 38

Fibroelastic Musculocavernous

Question 39

Describe the anatomy of the fibroelastic penis

Answer 39

- much fibroelastic tissue in corpus cavernosum - little increase in length/girth in erection - retractor penis muscle relaxes - sigmoid flexure stretches - ruminants, pigs

Question 40

Label the features of the fibroelastic penis

Answer 40

Question 41

Describe the musculocavernous penis

Answer 41

- more muscular/less connective tissue in corpus cavernosum - significant increase in length/girth during erection

Question 42

What is the glans penis?

Answer 42

Contains the opening of the urethra Supported only by corpus spongiosum (+os penis in dog) Lots of species variation

Question 43

Label this ram penis

Answer 43