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IMG1004: OB-GYN > week 4 > Flashcards

week 4 Flashcards

1
Q

Cell division that produces gametes- will have ½ normal somatic chromosomes components (Sex cells)

A

meiosis

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2
Q

of cells & chromosomes in meiosis

A

4 cells 23 chrom

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3
Q

division of a single cell that produces 2 identical cells with the same number of chromosomes

A

mitosis

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4
Q

Allows random assortment of maternal and paternal chromosomes between the gametes

A

meiosis

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5
Q

of cells and chromosomes in mitosis

A

2 cells, 46 chromosomes

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6
Q

What is the role of Zona Pellucida

A

sperm binding and protetction

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7
Q

Where does fertilization taking place

A

ampulla portion of Fallopian tubes

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8
Q

What does the term zygote means?

A

fertilized ovum

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9
Q

What gamete determinate gender of the human offspring

A

sperm

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10
Q

What is the name of the dividing cell right after conception

A

zygote

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11
Q

What happen during cleavage

A
  1. Mitosis is occurring and the cells are doubling in numbers
  2. Implantation completes cleavage
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12
Q

What does term morula mean?

A

16 cells produced after 4 rounds of cell division

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13
Q

Name the parts of blastocyst at the time of implantation.

A
  • inner cell mass
  • blastocyst cavity
  • trophoblast
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14
Q

At what time after fertilization dose implantation begin?

A

6 days after fertilization

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15
Q

Gametogenesis is ___

A

part of meiosis

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16
Q

in oogenesis @ ovulation is the start of___

A

second meiotic devision

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17
Q

when ___ occurs the second meiotic division is completed.

A

fertilization

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18
Q

follicular cells protective layer.

A

corona radiata

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19
Q

Fertilization takes place 24 to 12-24 hours after ___

A

ovulation

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20
Q

1st cleavage completes about ___ after ___

A
  • 30-40 hrs

- fertilization

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21
Q

1st mitotic division yields 2___

A

blastomeres

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22
Q

Cell division resulting in smaller and smaller cells is termed

A

cleavage

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23
Q

____ begins 24 to 30 hours after fertilization

A

mitosis

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24
Q

4-5 days post fertilization fluid passes into the morula and is termed

A

blastocyst

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25
trophoblast becomes the ___ and the fetal contribution to the placenta
chorion
26
inner cell mass becomes the ___
embryo, amnion, cord, and secondary yolk sac
27
in uterus, the blastocyst receives nutrients from ___
endometrial glands
28
___ completes the period of cleavage
implantation
29
during implantation trophoblast differentiates into 2 layers:
1. cytotrophoblast | 2. syncytiotrophoblase
30
___ invades the endometrium to from lacunae spaces
syncytiotrophoblast
31
outer multicelled layer of trophoblast with finger like projections
syncytiotrophoblase
32
Single cell inner layer forms the chorion
cytotrophoblast
33
T/F: implantation involves both endometrium & myometrium
FALSE- only endo
34
Primary function is the production of hCG to extend the life of the corpus luteum
trophoblast
35
Implantation that occurs where there is no endometrial lining is called
ectopic preg
36
blastocyst inner cell mass epiblast form the
amnionic cavity which secretes fluid
37
forms the primary umbilical vesicle aka primary yolk sac
hypoblast
38
within the ___ fluid spaces form to create the chorionic cavity
extraembryonic coelom
39
chorion surrounds the chorionic cavity and is made up of ___ and __ cells
- mesoderm | - trophoblast
40
also known as gestational sac
chorionic sac
41
1st sonographic evidence of an intrauterine pregnancy
GESTATIONAL SAC
42
umbilical vesicles produce ___ and nourish ___
- first blood cells | - conceptus
43
bilaminal embryonic disk has initially 2 layers ___ & ___
endoderm (inner) & ectoderm (outer)
44
biliminar converts to triliminar by ____
gastrulation
45
triliminar layers include
- endoderm - mesoderm - ectoderm
46
amnion is adjacent to the ___ (back of trilinimar disc)
ectoderm
47
yolk sac is adjacent to the ___ (infront of triliminar disc)
endoderm
48
T/F: all fetal tissues arise from grastulation triliminar layers
true
49
when cells migrate from hypoblast to create mesoderm b/w endo and ectoderm
primitive streak
50
endometrial layers
- decidua capsularis - decidua parietalis - decidua basalis
51
closes over and surrounds the burrowing blastocyst (developing embryo)
decidua capsularis
52
lines the rest of the endometrial cavity which is not implanted by the blastocyst
decidua parietalis
53
the area that the blastocyst attaches to the uterus and goes on to contribute to the maternal portion of the placenta
decidua basalis
54
implantation of embryo
1. blastocyst attach and imbed in decidua 2. blastocyst is imbeded in deepest layer decidua basalis whwere trophoblast proliferate. capsularis surround the blastocyst and pareitalis is on opposite side of uterine cavity 3. gestational sac grows, contour of decidua caps distorts uterine cav
55
what creates the double decidual sign
decidual caps & pareitalis
56
maternal blood supply to placenta via
villi
57
blood drained from placenta via
endometrial vein
58
placenta produces
- chronic gonadotropin - estrogen - progesterone
59
pregnancy test measure ___ levels
B-HCG
60
B-HCG produced by ___ until 10 weeks then placenta takes over
syncytiotrophoblasts
61
PRIMIGRAVIDA
pregnant for the first time
62
term for organogenesis 6-10 weeks LMP
EMBRYO
63
NULLIGRAVIDA
never been pregs
64
connects yolk sac to embryonic midgut
VITELLINE DUCT
65
1st trimester
LMP-13 weeks
66
2nd trimester
14wk-27 wks
67
3rd trimester
28 wk- term (40 weeks)
68
NORMAL PREGNANCY = ___ WEEKS / ___ DAYS
40 WEEKS / 280 DAYS
69
EDC
estimated date of confinement
70
EDD
estimated date of delivery

IMG1004: OB-GYN (12 decks)

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