(13.1) Reproductive System of the Dog - The Male Genital Organs in Dogs ( Finals )

Question 1

The external male genital organs are:

Answer 1

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

Question 2

The internal or accessory genital organs are:

Answer 2

– Prostate
– Ampulla of the ductus deferens

Question 3

• Oval, lies obliquely within the scrotum (with its long axis running dorsocaudally)

Answer 3

Testes

Question 4

a stout, white fibrous capsule that surrounds the surface of the testis

Answer 4

Tunica albuginea

Question 5

• The peritoneal layer that permits testicular mobility within the scrotum
• Develops from the vaginal process, an outpocketing of the abdominal peritoneum that exits the abdomen through the inguinal canal

Answer 5

Parietal and visceral vaginal tunics of the testis

Question 6

• Develops within the abdominal cavity, just caudal to the kidneys (retroperitoneal)
• Descend from their abdominal position to take up residence within the scrotum

Answer 6

Testes

Question 7

As the testis continues distally into the scrotum, it passes alongside (but not into) the?

Answer 7

vaginal process

Question 8

The vaginal process envelops testis forming two layers:

Answer 8

the visceral (directly against the testis) and parietal (directly against the internal wall of the scrotum) vaginal tunic

Question 9

• A pouch of skin carried high between the thighs in the caudal inguinal region
• Houses/covers the testes
• Controls testicular temperature

Answer 9

Scrotum

Question 10

covers the external scrotal surface, variably pigmented, thin (facilitating heat loss), slightly oily, sparsely covered by fine hairs, and little subcutaneous fat is present

Answer 10

Skin

Question 11

a thin layer of smooth muscle, elastic and collagenous fibers; contracts the scrotal skin when the cremaster muscle draws the testes near the body (during cold temp. and sympathetic drive)

Answer 11

Muscle (tunica dartos)

Question 12

the parietal layer of the vaginal tunic forms the inner lining of the scrotum

Answer 12

Peritoneum

Question 13

divides the internal cavity of the scrotum in half

Answer 13

Median septum

Question 14

a line (external) extending the full length of the scrotum along the midline

Answer 14

Scrotal raphe

Question 15

• The convoluted tubular structure that stores maturing and mature sperm following their production by the testis and prior to their ejaculation

Answer 15

Epididymis

Question 16

Epididymis Position:

Answer 16

slightly applied to the dorsolateral surface of the testis

Question 17

Part of the epididymis that lies at the cranial head of the testis; continuous with the internal duct system of the testis

Answer 17

Head

Question 18

Part of the epididymis that passes along the dorsolateral region of the testis

Answer 18

Body

Question 19

the caudal extremity of the epididymis, continuous with the ductus (vas) deferens

Answer 19

Tail

Question 20

This ligament attaches the epididymal tail to the vaginal tunic and the internal spermatic fascia

Answer 20

Ligament of the tail of the epididymis

Question 21

This ligament attaches the tail of the epididymis to the caudal pole of the testis

Answer 21

Proper ligament of the testis

Question 22

• The tubular organ that conduct sperm from the tail of the epididymis to the prostatic region of the urethra

Answer 22

Ductus Deferens

Question 23

Ductus Deferens Course:

Answer 23

– Testis
– Spermatic cord
– Abdominal cavity
– Prostate gland
– Prostatic urethra

Question 24

Ductus deferens passes from the lateral to medial surface of the caudal testicular pole; straightens and pass cranially along the dorsomedial border of the testis towards the cranial testicular pole

Answer 24

Testis

Question 25

It pass as one of the components of the spermatic cord through the inguinal canal and enters the interior of the abdominal cavity

Answer 25

Spermatic cord

Question 26

courses slightly more cranially to make a wide arc across the lateral surface of the bladder cranial to the ureter

Answer 26

Abdominal cavity

Question 27

turns caudally and courses towards the prostate gland; pierces and enters the lobe of the prostate gland

Answer 27

Prostate gland

Question 28

passes through the substance of the gland before opening into the lumen of the prostatic urethra

Answer 28

Prostatic urethra

Question 29

• A collection of structures passing to and from the testis • Extends from the deep inguinal ring to the testis

Answer 29

Spermatic Cord

Question 30

What structure contains the testicular artery and vein, efferent testicular lymphatic vessels, testicular nerve, and the ductus deferens with its associated artery and vein?

Answer 30

Spermatic cord

Question 31

– The components of the spermatic cord are invested by the visceral layer of the original vaginal process

Answer 31

Mesenteries

Question 32

What surrounds the deferent duct, artery and vein?

Answer 32

Mesoductus deferens

Question 33

surrounds the testicular artery, vein, nerves and efferent lymphatics

Answer 33

Mesorchium

Question 34

This muscle originates from the caudal edge of the internal abdominal oblique; elevates the testis in response to cold or to sympathetic drive

Answer 34

Cremaster muscle

Question 35

specialization of testicular vein; convoluted veins that cools the arterial blood to testes by countercurrent exchange

Answer 35

Pampiniform plexus

Question 36

This animal have a musculocavernous penis characterized by predominance of cavernous tissue (tissue containing a myriad of small spaces that fills with arterial blood to achieve erection of the penis)

Answer 36

Dogs

Question 37

the most proximal portion of penis, located in the region of ischial arch

Answer 37

Root

Question 38

two paired regions ( root of the penis )

Answer 38

Crura

Question 39

median region ( root of the penis )

Answer 39

Bulb

Question 40

the intermediate portion of the penis extending from the root to the beginning of the glans; the narrowest region of the penis

Answer 40

Body

Question 41

the most distal free portion of the penis; slightly larger than the body in the non-erect state

Answer 41

Glans

Question 42

globular in shape; entirely surrounds the proximal end of the glans; the most distensible part, increases dramatically in size owing to its role in forming the “tie” or “lock” characteristic of canine copulation

Answer 42

Bulbus glandis

Question 43

the elongate distal portion of the glans

Answer 43

Pars longa glandis

Question 44

surrounds the urethra

Answer 44

Corpus spongiosum

Question 45

contributes in the formation of the root, body and glans

Answer 45

Corpus spongiosum penis

Question 46

forms a portion of penile root and contributes to the formation of body and glans; surrounds the urethra in the region of ischial arch

Answer 46

Bulb of the penis

Question 47

comprise the two parts of the penile glans (bulbus glandis and pars longa glandis)

Answer 47

Corpus spongiosum glandis

Question 48

positioned dorsal to the urethra

Answer 48

Corpus cavernosum

Question 49

originates as the paired crura of the penis; blends with the base of the os penis

Answer 49

Tunica albuginea

Question 50

extends through the full length of the penile glans

Answer 50

Os penis

Question 51

contraction obstructs venous outflow from the penis, necessary from the beginning of penile erection throughout copulation ( muscle )

Answer 51

Ischiourethralis muscle

Question 52

This muscle withdraw the penis into the prepuce following erection

Answer 52

Retractor penis muscle

Question 53

The sheath of skin that houses the penile glans when the penis is not erect

Answer 53

Prepuce

Question 54

ring at the cranial end that opens into the preputial cavity

Answer 54

Preputial orifice

Question 55

forms a blind “gutter” the preputial fornix

Answer 55

Internal lamina

Question 56

• Prevents the prepuce from dangling from the end of the glans when the penis is flaccid • During erection, relaxes and allows the glans to protrude from the prepuce • After erection, contracts and draw the prepuce back over the penile glans

Answer 56

Preputial muscle

Question 57

• Accessory Genital Organ • A bilobed organ surrounding the neck of the urinary bladder and the urethra • Secretion of the gland contribute to the seminal fluid

Answer 57

The Prostate Gland