Ch 10 - Conception & Fetal Dev Flashcards Preview

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Flashcards in Ch 10 - Conception & Fetal Dev Deck (100)
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1

Union between a single sperm and egg that marks the start of a pregnancy

conception

2

process of conception

gametogenesis

ovulation

fertilization

implantation

3

Process by which oocytes and spermatocytes are produced

Gametogenesis

4

When does oogenesis begin?
When does spermatogenesis begin?

oogenesis: during fetal life. When a female is born, she is born with all the eggs she will ever have (2 million, most of which degenerate, leaving only 400-500)

spermatogenesis: starting from puberty, continues into 80s and 90s.

5

Describe Ovulation

- what occurs
- hormones responsible for follicular rupture
- what occurs to make fraternal twins possible

Each month one ova matures and is released from its ruptured ovarian follicle

hormones responsible: LH, FSH. Occasionally, two ovum

are released, making fraternal twins possible

6

High levels of ________ increase the motility of the fallopian tubes so that the cilia are able to move the ova through the tube toward the uterus

estrogen

7

Most common site of conception

ampulla

8

If fertilization is to occur, it usually takes place in the _______ _______ of the tube

outer third

9

Ova are fertile for __ hours after ovulation. If fertilization does not take place in this timeframe, the ova breaks down and is reabsorbed.

24

10

Protective layers will need to be penetrated by sperm in order for fertilization to occur. This is able to occur when __________ from the ______ are released and aid in breaking down that protective coating of the ova

enzymes, sperm

11

Typical male ejaculation contains # - # million sperm & can live in a woman’s reproductive tract for # - # days

2-5 million sperm
2-3 days

12

Occurs when a sperm is able to penetrate the membrane surrounding the ova

At this time, both ova and sperm become enclosed in the membrane

fertilization

13

Progression of zygote to implantation

zygote --> 2 cell --> 4 cell --> morula (little mulberry) --> blastycyst/trophoblast/embryoblast --> implantation

14

eventually will be placenta

embryoblast
blastocyte
trophoblast

trophoblast

15

eventually will become embryo

embryoblast
blastocyte
trophoblast

embryoblast

16

whole structure of developing embryo

blastocyte

17

When the protective coating degenerates, trophoblast cells will displace the endometrial cells at the implantation site and the blastocyst embeds itself on the endometrium when uterus is at its most nourished

usually occurs in fundus endometrium w/in 6-10 days after conception

implantation

18

implantation in cervix
blocks baby's passage
requires c-section

placenta previa

19

What will secrete enzymes to allow the fertilized egg to burrow into the endometrium and cover the blastocyst?

trophoblast

20

What occurs @ the site of implantation that makes implantation bleeding occur? - usually around the same time as the when a period might occur which makes women miss the first month of pregnancy

Endometrial blood vessels erode

21

conception - day 14

pre-embryonic

22

week 2 - 8

embryonic

23

Week 9 - birth

fetal

24

which period is the baby at greatest risk due to drugs, alcohol, trauma, malnutrition, smoking, lack of folic acid, measles?

what might these things cause?

Why is she @ greatest risk?

embryonic

spontaneous miscarriage or fetal development issues

mom doesn't know she's pregnant

25

When do people generally realize they're pregnant?

6 weeks

26

What is the primary reason for barrier methods with pregnant women?

protection from STI

27

Develops into epidermis, glands, hair and nails, nervous systems, lens of the eye, tooth enamel, and floor of amniotic cavity

Ectoderm

28

Develops into bones, teeth, muscles, dermis, connective tissue, spleen, genitourinary, and cardiovascular system

Mesoderm

29

Lining of respiratory and digestive tracts, and the glandular cells of associated organs. Forms the roof of yolk sac.

Endoderm

30

which stage is most crucial for development and organogensis in babies?

rapid cell division occurs and most vulnerable to outside influences

By end of this stage, all organ systems are present, as well as external structures

Unmistakable human appearance by the end of this period - hands, feet, cardiac movement

embryonic