Chapter 2 gametogenesis Flashcards Preview

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Flashcards in Chapter 2 gametogenesis Deck (59)
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1

primitive sex cords

supporting cells plus the germ cells

2

genital ridges

areas where the gonads are going to form

3

What are the supporting cells of the female ?

follicular cells

4

what are the supporting cells of the male?

sertoli cells

5

In male gametogenesis, primordial germ cells lay dormant until when ?

puberty

6

What hormone and cells places an important role in male gametogenesis

LH and leydig cells

7

When does spermatogenesis stop ?

when the person dies

8

What hormone do the leydig cells secrete?

testosterone

9

what starts the process of spermatogensis?

secretion of testosterone by the leydig cells

10

spermiogenesis

conversion of spermatids into mature sperm

11

What four steps occur in spermiogenesis?

lose the cytoplasm, condense nucleus, neck+ tail added and acrosome added

12

maturation of the sperm occurs where ?

vagina of the female

13

at week 12 what major step happens in female gametogenesis

population of oogonia after their first meiotic prophase become dormant until puberty!

14

ovarian follicle

capsule and the follicle

15

What do the follicular cells secrete that prevent further progression of the cell cycle in female gametogenesis ?

OMI-oocyte aturation inhibitor helps arrest the process and puts the break in meiosis

16

What are the two stages of the ovarian cycle ?

follicular stage and the luteal phase

17

in 5-12 primordial follicles what happenes as a result of FSH and LH ?

the follicular cells begen to thicken to cuboidla cells and it becomes a primary follicle

18

zona pellucida

a glycoprotein coat sereted by the follicular cells and the oocyte together

19

graafian follicle

the structure that is formed that has an antrum (take up of fluid and space) when the main follicle continues to develop

20

what hormone secretes HcG

SYNCYTIOTROPHOBLAST

21

what hormone does the corpus luteum secrete

progesterone until the placenta takes over

22

malformations

occur during organogenesis in the embryonic period and result in abnormal structure

23

disruptions

result from external influence that causes alterations of completely formed structures

24

deformations

abnormal form resulting from mechanical forces (club foot is an example)

25

dysplasia

abnormal organization of cells into tissue (sacrococcgela teratome)

26

what percentage of congenital abnormalities is caused by genetic factors ?

28%

27

agenesis

absence of an organ

28

aplasia

cells to form an organ never formed

29

association

anamalies occuring together without determiend cause

30

atresia

absence of an opening or lumen