EX3 Embryology - Genital System Flashcards Preview

SP14 Anatomy > EX3 Embryology - Genital System > Flashcards

Flashcards in EX3 Embryology - Genital System Deck (45):
1

What germ layer is the genital system derived from

intermediate mesoderm

2

Intermediate mesoderm thickens at week 5 to form what precursor to the genital system

gonadal ridge

3

At what week do the visible differences of the genital system show

week 7
weeks 1-6 are the "indifferent stage"

4

The sex of an individual is determined at what stage

conception

5

What are the two ducts that are precursors to the male/female gonads

males - mesonephric (Wolffian) duct
females - paramesonephric (Müllerian) duct

6

The mesothelium lining of each gonadal ridge thickens to form what

mesothelial cells = gonadal cord cells

7

The mesothelial cord cells form what

solid gonadal cords that sink into underlying mesenchyme to "welcome" PGCs

8

SRY codes for what

TDF; testes-determing factor

9

These develop from mesenchyme of gonadal ridge and produces testosterone

leydig cells

10

These develop from gonadal cord cells and forms the seminiferous tubules and rete testes

sertoli cells ("caretakers of PCGs")

11

How are seminiferous tubules formed

by an invagination of cord cells

12

What induces the mesonephric duct to form male genital ducts and external genitalia

testosterone

13

Testosterone causes the mesonephric ducts and mesonephric tubules to do what

puncture the region of the gonadal ridge where testicles are developing to form the ductus deferens, epididymis, and efferent ductules connections

14

The mesonephric duct becomes what in males

ductus deferens

15

The superior end of the mesonephric duct becomes what in males

epididymis

16

The mesonephric tubules become what in males

efferent tubules

17

The caudal ends of mesonephric ducts develop what

seminal vesicles and ejaculatory ducts which open into prostatic urethra

18

The Müllerian duct reman at becomes what in males

appendix testis

19

The Müllerian duct regresses in males due to which cell signalsing

Sertoli cells; produces MIH (Müllerian-inhibiting hormone)

20

The prostate and bulbourethral glands are endodermal outgrowth from what

urogenital sinus

21

This extends from the gonad to the labioscrotal swelling

gubernaculum

22

The descent of the testes begins in which weeks and ends when

begins week 26; both testes in scrotum by week 32

23

What is the gubernaculum

it is a ligament that as it shortens, it pulls the testis, ductus deferens, and testicular vessels downward traversing the inguinal canal to the scrotal sac

24

Where are the layers of the spermatic cord derived from

anterior abdominal wall muscular layers/fascia that are dragged inferiorly with the testes

25

This is the development of fluid-filled cysts of the testes/spermatic cord

hydrocoele

26

This is the failure of the testes to descend

crytochidism

27

True or False
The female genital system contains SRY and TDF

False; it does not

28

Where do the stromal cells of the developing ovary originate from

mesenchyme of gonadal ridge

29

Follicular cells ("caretakers" of the PGCs" develop from what

gonadal cord cells

30

These envelop PGCs

cortical cords (comprised of cord cells)

31

Cortical cords break up into pieces, and cord cells develop into what

flat follicular cells that surround each oogonium

32

The primary oocyte plus the follicle cell capsule makes up what

primordial follicle

33

Due to low testosterone in females, what happens

mesonephric ducts regress

34

Due to no MIH in females, what happens

continued grout and development of Müllerian ducts

35

Epoöphoron, paraöphoron, and gartner duct cysts are what in females

remnants of mesonephric duct

36

The cranial end of the Müllerian ducts form what

uterine tubes

37

The caudal end of the Müllerian ducts fuse to form what

uterovaginal primordium; which forms the uterus and superior vaginal canal

38

The uretovaginal primordium comes in contact with dorsal wall or urogenial sinus and induces the formation of what

sinovaginal bulbs; pair of endodermal outgrowths

39

The sinovaginal bulbs fuse with the uretovaginal primordium forming what

the vaginal plate (inferior vagina)
*formed from urogenital sinus*

40

The vaginal canal forms from what

the degeneration of the vaginal plate central endodermal cells

41

What are the endodermal outgrowths from the urogenital sinus

greater vestibular glands
urethral glands
paraurethral glands

42

The gubernaculum in females forms what

the ovarian and round ligament

43

The genital tubercle forms what in males/females

males - glans penis (head)
females - clitoris

44

The labioscrotal swelling (genital swelling) forms what in males/females

males - scrotum
females - labium majus

45

The urethral folds form what in males/females

males - penile shaft
females - labium minus