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Embryology > Tutoring Review > Flashcards

Tutoring Review Flashcards

1
Q

What are the two reasons the PGCs migrate to the dorsal wall?

A
  1. allows time for gonads to form

2. proliferate in 5th week

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2
Q

What is the chromosome amount during primary oocyte?

A

46 4N

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3
Q

How many chromsoomes are there for secondary spermatocyte

A

23 2N

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4
Q

what is chromsoome amount of spermatids and mature oocyte

A

23, 1N

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5
Q

During the fifth month what are the primary oocytes arrested at?

A

prophase 1

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6
Q

primary follicle and secondary follicle both have what inside

A

primary oocyte (secondary has follicular antrum as well)

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7
Q

what does tertiary follicle contain

A

secondary oocyte + antrum

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8
Q

why is a tertiary follicle important

A

during ovulation the granular cells and theca interna form the corpus leuteum

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9
Q

what happens to corpus leuteum if there is no fertilization

A

corpus albicans

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10
Q

what acts as primitive placenta for first 20 weeks of pregnancy

A

corpus leuteum

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11
Q

does a spermatid fertilize?

A

no it’s a spermatazoa

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12
Q

when the acrosome cap forms it’s where

A

on top of sperm

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13
Q

what reaction happens when the sperm enters the egg

A

acrasome reaction

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14
Q

what is the zona reaction

A

what happens after fusion of oocyte and sperm -prevents fusion of multiple sperm with egg. it’s also called corticol reaction

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15
Q

what enters the uterus

A

morula

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16
Q

zona pelucida doesn’t degrade what happens

A

implantation cannot take place

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17
Q

where does blastocyst implant

A

superior posterior to uterus

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18
Q

3 major thin in week of 3

A

gastrulation
neurulation
primitive streak

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19
Q

what makes up primary villi

A

cytotrophoblast and synchiotorophlbas

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20
Q

hydratiform mole

A

when trophoblast develops

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21
Q

what does trophoblast need to develop

A

just male pronucleus

22
Q

hydratiform mole

A

when trophoblast develops (just need paternal genes), causes cancer

23
Q

what does trophoblast need to develop

A

just male pronucleus

24
Q

what order do endoderm, mesoderm, ectoderm, and hypoblast form?

A

hypoblast then endoderm then mesoderm then ectoderm

25
Q

what drives into endometrium

A

synctiotrophoblast

26
Q

what helps third population come out

A

maneuvering of notocord

27
Q

why is allantois important

A

if dont have it will not have umbilical cord or abilical arteries or veins

28
Q

does ambilical vein have oxygenated blood?

A

oxygenated

29
Q

what two major portions do neural crest cells come about

A

cardio with membranous ventricular septum

medulla of adrenal gland

30
Q

what is importance of gastrula polarity

A

how primtivie streak gives rise to orientation

31
Q

what is important for heart fold

A

heart goes ventrally

32
Q

what is important for tail fold

A

pushes alantoid into connecting stalk

33
Q

what’s in secondary chorionic villi

A

3 layers:

34
Q

maternal side of placenta hormones can’t cross but what can

A

drugs (teratogans can cross)

35
Q

what is the maternal side of placenta

A

cotyeldon

36
Q

septum transversum is what

A

diaphgragm

37
Q

bochdalek hernia is

A

postereolateral

38
Q

morgani hernia

A

problems in midline

39
Q

bochdalek & morgani hernia are both

A

congenital & diagphragmatic

40
Q

spleen is what

A

LPM not endoderm

41
Q

dorsal mesentary grows faster than what

A

ventral - why there is 90 degree rotation

42
Q

foregut is what mesentary

A

dorsal & ventral

43
Q

midgut and hindgut are what mesentary

A

just dorsal mesentary

44
Q

pseudoglandular period

A

no respiration happening

45
Q

canalicular period

A

a little respiration but not adeuqte - terminal bronchioles

46
Q

what’s the earliest baby can be delivered

A

24

47
Q

upper limb rotates how

A

dorsolaterally 90 degres

48
Q

lower limb roates how

A

ventromedially 90 degrees

49
Q

what is first artery to supply upper limb

A

common interosseus

50
Q

what supplies the lower limb

A

umbilical artery which then becomes ischiatic artery

Embryology (16 decks)

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