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Anatomy > Embroyology > Flashcards

Embroyology Flashcards

1
Q

pre embroyonic period

A

0- 2 wks

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2
Q

embroyonic period

A

3- 8 wks

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3
Q

fetal period

A

9 wk till birth

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4
Q

primordial germ cell formed from where and when

A

epiblast from 2nd week

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5
Q

pgc migrates to yolk sac at

A

4th week

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6
Q

pgc reach gonads at

A

5th week

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7
Q

pleuripotent vs totipotent vs multipotent

A
  1. all germ cell layers–> a new organism
  2. an embroyo with extraembroyonic tissue
  3. more than one category of cells
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8
Q

teratoma cell of origin and examples

A

pgc
craniopharyngeal
sacrococcygeal

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9
Q

fate of corpus luteum if no fertilisation

A

albicans

persists for 14 days and shrink 3-4 days before menstruation–> corpus albicans

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10
Q

fsh target and action

A

theca and granulosa cells
secrete estrogen and progesterone

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11
Q

lh surge timeline from beginning to peak
fsh peak when

A

lh surge begins 36 hrs before ovulation, peaks at 12 hrs before

fsh peAk ; 12 hrs prior but always less than LH

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12
Q

WHAT IS SPERMIOGENESIS

A

REARRANGEMENT OF ORGANELLES TO FORM ACROSOMAL CAP, TAIL, CYTOPLASM SHEDDING

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13
Q

NO. OF SPERMATIDS FROM 1 SPERMATOGONIUM

A

64 TO 512

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14
Q

SPERMATOGENESIS IS COMPLETED IN HOW MANY DAYS

A

74> 64 > 60

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15
Q

IN MALES MEIOSIS OCCURS IN

A

SEMINIFEROUS TUBULES

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16
Q

SPERM MATURATION OCCURS IN

A

EPIDIDYMIS

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17
Q

MOST FERTILE PERIOD IN MENSTRUAL CYCLE AND WHY

A

3 DAYS –> 2 DAYS BEFORE OVULATION AND 1 DAY AFTER

SPERM VIABLE FOR 48 HRS
SECONDARY OOCYTE FOR 24 HRS

18
Q

HOW TO DETECT TIME OF OVULATION

A

LH PATCH - DETECTS LH SURGE, CHANGES COLOUR

19
Q

HEAD OF SPERM FROM

A

NUCLEUS

20
Q

SPERM ACROSOMAL CAP FROM

A

GOLGI APPARATUS

21
Q

fertilisation occurs in

A

AMPULLA

22
Q

ENZYMES OF ACROSOMAL REACTION

A

ACROSIN
ACID PHOSPHATASE
HYALURONIDASE

23
Q

PROCESS AND PURPOSE OF CORTICAL REACTION

A

ON SPERM PENETRATION THROUGH ZP CORTICAL GRANULES INSIDE 2 OOCYTE RELEASE ENZYMES –> CHANGE IN PERMEABILITY OF ZP

PREVENTS POLYSPERMIA

24
Q

TIME OF ZYGOTE FORMATION

A

12- 24 HRS AFTER OVULATION

25
Q

CELLULARITY OF EMBROYO ENTERING UTERUS
AND TIME AFTER FERTILISATION

A

32
ADVANCED MORULA
4 TH DAY AFTER

26
Q

CAVITATION OCCURS IN

A

ADVANCED MORULA

27
Q

MAXIMUM CELLULARITY OF TOTIPOTENT CELLS

A

8 CELLS

28
Q

COMPACTION OCCURS AFTER

A

8 CELLED STAGE

29
Q

BLASTOCYST FORMED WHEN

A

4 - 5 DAY POST FERTILI

30
Q

PLACENTA DERIVED FROM

A

TROPHOBLAST OR OUTER CELL MASS

31
Q

EMBROYO DERIVED FROM

A

INNER CELL MASS OR EMBROYOBLAST

32
Q

BLASTOCYST CELLULARITY

A

58

33
Q

FUNCTIONS OF ZONA PELLUCIDA

A
  1. PREVENTS POLYSPERMY
  2. PREVENTS IMPLANTATION
34
Q

HATCHING OF BLASTOCYST OCCURS AT

A

5TH DAY AFTER FERTILI

35
Q

TIMELINE OF IMPLANTATION

A

BLASTOCYST
STARTS FROM 6-7 TH DAY ENDS BY 10TH - 11TH DAY

36
Q

CELLULARITY AT TIME OF IMPLANTATION

A

100- 250

37
Q

HARTMAN’S SIGN

A

BLEEDING AT IMPLANTATION.

38
Q

SITE OF IMPLANTATION

A

UPPER PART OF POSTERIOR WALL OF UTERINE CAVITY
DEEP LAYER OF DECIDUA

39
Q

FIRST SIGN ON USG

A

INTRA DECIDUAL SIGN
SHOWS GESTATIONAL SAC

40
Q

MC SITE OF ECTOPIC PREGNANCY

A

AMPULLA

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