Comparative & Developmental Reproductive Anatomy Flashcards Preview

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Flashcards in Comparative & Developmental Reproductive Anatomy Deck (44)
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1

What 3 sources are gonads derived from?

- Mesothelium: (mesodermal epithelium) lining posterior abdominal wall

- Underlying mesenchyme: (embryonic connective tissue)

- Primordial Germ Cells: (earliest undifferentiated sex cells)

2

What is an indifferent gonad?

Primordial organ before differentiation into gonads

3

At what week are initial stages of gonadal development?

5 wk

4

What produces the gonadal ridge?

Proliferation of mesothelium and underlying mesenchymal cells

5

What is the permanent kidney primordium?

Thickened area of mesothelium developing on medial side of mesonephros

6

Indifferent gonad consists of

External cortex

Internal medulla

7

Cortex differentiates into

Ovary, medulla regresses

8

Indifferent gonad:

Medulla differentiates into

Testes, cortex regresses

9

What do the Gonadal cords become in males at wk5?

Seminiferous cords (Primordia of the seminiferous tubules)

10

What do the parts of the gonadal cords that enter the medulla become in wk 5?

Rete Testes

11

What 2 kinds of cells are made during wk 5 male sexual differentiation in gonads?

Spermatogonia And Sertoli Cells

12

What are spermatogonia derived from?

Primordial germ cells

13

What are sertoli cells derived from?

Mesenchyme

14

What are follicular cells derived from?

Surface epithelium of ovary

15

Which duct is the paramesonephric duct?

Mullerian

16

Which duct is the mesonephric duct?

Wolffian

17

In male embryo, SRY turns on expression of...

Testis determining factor

18

What cells make Anti-Mulerian Hormone?

Sertoli Cells

19

Wolffian duct becomes the ...

Conductive ducts: epididymis, vas deferens, seminal vesicles

20

Where are PCGs initially located?

Amongst endodermal cells of yolk sac, near origin of allantois

21

PCGs migrate along...

Dorsal mesentery of hindgut to gonadal ridges

22

What is happenening to PGCs during 6th week of development?

PGCs enter underlying mesenchyme and incorporated into gonadal cords.

23

The Homologous Genital tubercle differnetiates into:

Penis (male), Clitoris (female)

24

The urethral folds develop into the:

Penile urethra (male), labia minora (female)

25

The urethral groove deveops into the:

 

Disappears in males, Vestibule (Females)

26

The labioscrotal swelling develops into the:

 

Scrotum (male), Labia majora (female)

27

What directs direction of descent of ovaries and testes?

Gubernaculum

28

Why does the testes descend into the scrotum?

Temperature regulation for sperm production

29

What happens to the gubernaculum in males?

Shrinks into a small structure attached to the base of the scrotum

30

What happens to the gubernaculum in women?

Gives rise to the ovarian and round ligaments, the latter is attached to the labia majora