Development of the Male and Female Reproductive System

Question 1

*The reproductive system is composed of the ____ in male and ____ in female

Answer 1

testes, penis, and accessory glands

ovaries, uterus and vagina and vulva

Question 2

The primordia of both male and female reproductive systems develop in the so- called ____ of devt.

Answer 2

indefferent stage

Question 3

*The 1st indication of gonad formation is a swelling on the mesial side of the mesonephros called- ____

Answer 3

gonadal ridge

Question 4

epithelial components form the ____
(primitive sex cords)

Answer 4

gonadal cord

Question 5

*If the embryo is to become a male ( Y chromosome) , a male gonad develops in
the ____ of the of the gonadal ridge
*The gonadal cords form solid tubes which at birth become patent and form the _____

*These tubules are arranged in loops that are connected to the duct system, both are derivatives

Answer 5

medullary region

seminiferous tubules

Question 6

*The primary germ cells in the gonadal cords become the ____ in
the definitive testis and in the ____

Answer 6

spermatogonia

mesonephric tubules

Question 7

*If the embryo is to become a female, the epith. gonadal cords break up into many small clusters called ____

Answer 7

follicles

Question 8

*In male, some parts of the mesonephros will give rise to the ffg.

Answer 8

efferent tubules (mesonephric tubules that fused with the gonadal cords)

epididymis (Mesonephric duct closely associated with the testis)

ductus deferens (Caudal part of the mesonephric duct)

Question 9

*In female, the paramesonephric ducts become the ffg;

Answer 9

Fallopian tubes
Horn,body and cervix of the uterus
Part of the vagina

Question 10

*Types of Uterus

has 2 uteri, characteristic of marsupials

Answer 10

Duplex

Question 11

the body of the uterus is partitioned, found in some rodents and small ruminants

Answer 11

Bipartite

Question 12

horns of the uterus are most prominent,found in pig,dog

Answer 12

Bicornuate

Question 13

body is prominent,found in man

Answer 13

Simplex

Question 14

*The formation of the external genitals also occur during the ____ where the mesoderm adjacent to the cloacal membrane creates a series of swellings:

Answer 14

indifferent stage

Question 15

*external genitalia

mesoderm adjacent to the cloacal membrane creates a series of swellings: (3)

Answer 15

Genital tubercle
Urogenital fold
Genital swelling

Question 16

mesodermal swelling at the cranioventral end of cloaca

Answer 16

Genital tubercle

Question 17

fold lateral to the cloaca

Answer 17

Urogenital fold

Question 18

mesodermal swellings located peripheral to the urogenital folds

Answer 18

Genital swelling-

Question 19

*Fates of primordial structure in Male

Apex becomes glans penis
Remaining part – body of penis

Answer 19

Genital tubercle

Question 20

*Fates of primordial structure in Male

fuse to form the penile urethra

Answer 20

Urogenital fold

Question 21

*Fates of primordial structure in Male

become the scrotum which shift cranially,

closely apposed to the genital tubercle in

 ox dog, horse and
Cat and pig –remains beneath the anus

Answer 21

Genital swelling

Question 22

*Fates of primordial structures in Female

become the clitoris

Answer 22

Genital tubercle

Question 23

*Fates of primordial structures in Female

become the labia or lips of the vulva

Answer 23

Urogenital fold

Question 24

*Fates of primordial structures in Female

disappear in most species
 In most mammals this canal closes, forming the tunica vaginalis.

3. Ovaries descend as well, but come to rest in the pelvic cavity.

Answer 24

Genital swellings

Question 25

Descent of testis in the inguinal canal occurs at:

106 dys

Answer 25

bull

Question 26

70 dys

Answer 26

boar

Question 27

*Descent of the gonads

Near birth

Answer 27

stallion

Question 28

3-4 dys post natal

Answer 28

dog

Question 29

At 35 dys testes are in the scrotum

Answer 29

dogs post partum

Question 30

–failure of the testis to descend in the scrotum

Answer 30

Cryptorchidism

Question 31

Both gonads arise high up on the body wall associated with the mesonephros, but then migrate posteriorly related to differential growth.

Answer 31

Descent of the Gonads

Question 32

The testes pass down the posterior ____, behind the peritoneum, coming to lie in the forming scrotal pouches.

Answer 32

body wall

Question 33

Covering the front of each ____ is the processes vaginalis, an extension of the peritoneal membrane.

Answer 33

testis

Question 34

*In both sexes , develop from a pair of linear ectodermal ridge – ____ which are visible on the ventrolateral surface of the trunk between the levels of the limbs

Answer 34

mammary ridges

Question 35

*Length of (mammary) ridges varies

reaches from axilla to the inguinal region, in what animals?

Answer 35

carnivores and swine

Question 36

*Length of (mammary) ridges varies

limited only in the inguinal region, in what animals?

Answer 36

*ruminants and horse-