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Repro Anatomy > Embryology > Flashcards

Embryology Flashcards

1
Q

The Intermediate Plate Mesoderm forms the

A

Urogenital System

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2
Q

Gastrulation happens in

A

Week 3

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3
Q

Neuralation happens in

A

Week 3

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4
Q

Somite Formation happens in

A

Week 3

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5
Q

Maturation of organ systems happens in

A

Week 9 onwards

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6
Q

Pronephros develops what set of kidneys

A

Cervical Region

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7
Q

Mesonephros develops what set of kidneys

A

Thoracoculmbar

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8
Q

Metanephros develops what set of kidneys

A

Pelvic Region

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9
Q

What happens in Week 5 Embryology Repro

A

Genital Gonadal Ridge Formation

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10
Q

Germ cells migrate into

A

Indifferent Gonad in Week 6

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11
Q

What tube comes para-mesonephric duct

A

Epithelium of Mesonephros tube

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12
Q

What develops lateral to developing gonads and mesonephric duct

A

Para-Mesonephric Duct

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13
Q

Wolffian Duct is also known as

A

Mesonephric duct

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14
Q

Mullerian Duct is also known as

A

Paramesonephric Duct

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15
Q

Gonad forms

A

Testis

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16
Q

Mesonephric Duct develops into (3)

A

Epididymis, Vas Deferens and Seminal Vesicle

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17
Q

Urogenital Sinus forms what in males

A

Bladder, Urethra and Prostate

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18
Q

Gonad in the female forms

A

Ovary

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19
Q

Paramesonpehric Duct in females forms

A

Fallopian Tube, Uterus, Cervix Part of Vagina

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20
Q

Urogenital Sinus forms what in females

A

Bladder and Lower Vagina

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21
Q

Primordial Supporting Cells expresses

A

SRY Encodes

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22
Q

Primordial Supporting cells transforms SRY into

A

Sertoli Cells

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23
Q

Sertoli Cells secrete

A

Mullerian Inhibiting Substance

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24
Q

What does Paramesonephric Duct do in males

A

Degenerates

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25
Q

Leydig cells produces

A

Testosterone

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26
Q

Mullerian Inhibiting Substance transforms Mesenchymal cells between cords to form

A

Leydig Cells

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27
Q

Leydig Cells and Sertoli Cells can be found in what histology

A

Testis

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28
Q

What happens in week 5 of testis development

A

Primary Sex Cords, Medulla and Cortex

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29
Q

What happens in week 7 of testis development

A

TDF Stimulates Primary Sex Cords and extends into medulla seminferous cords tubules

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30
Q

What between cords gives rise to Interstitial cells of leydig

A

Mesenchyme

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31
Q

By week 8 what does Leydig Cells Produce

A

Testosterone

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32
Q

In males what does paramesonephric duct do

A

Degenerates

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33
Q

Seminal Vesicle is an outgrowth from

A

Caudal end of mesonephric duct

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34
Q

Prostate is an outgrowth from

A

Urethra

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35
Q

In the presence of what does gonad develop into testis

A

TDF

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36
Q

What two things does female fetus not have that male does

A

No SRY Region and No TDF region

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37
Q

By 10 weeks secondary sex cords develop from

A

Surface Epithelium

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38
Q

Primordial Follicles forms from

A

16 Weeks

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39
Q

By what month have all follicles formed in female development of ovary

A

7 Month

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40
Q

Oocytes enter meiosis and are arrested in what meiotic division in development of ovary

A

Prophase 1st Meiotic Division

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41
Q

After puberty hormonal influences stimulate how many follicles

A

12-15 follicles per 28 day cycle

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42
Q

Absence of testosterone in females causes

A

Degeneration of mesonephros and mesonpehric duct

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43
Q

What gives rise to female genital tract

A

Paramesonephric Duct

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44
Q

Which end of paramesonephric duct becomes associated with ovary

A

Cranial (open funnel)

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45
Q

Which part of paramesonephric duct (uterovaginal primordial) becomes uterus and superior vagina

A

Caudal End

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46
Q

Inferior Part of Vagina forms from

A

Urogenital sinus

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47
Q

Gonads initially forms where

A

Lumbar Region

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48
Q

At Week 7 where is Testis

A

T10

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49
Q

At week 12 where is testis

A

level of deep inguinal ring until 7th month

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50
Q

When do testis enter scrotum

51
Q

Where is ovary located in week 7

52
Q

Week is ovary located in week 12

A

Broad Ligament

53
Q

Round ligament is drawn through inguinal canal to attach to

A

Labrum Majorum

54
Q

How to Manage Undescended Testis

A

Orchiopexy

55
Q

Paramesonephric Dut becomes

A

Fallopian Tube, Uterus, Cervix and Vagina

56
Q

Sperm can survive

57
Q

Oocyte can survive

58
Q

Acrosome reacts with what in fertilisation

A

Zona Pellucida and Periviteline Space

59
Q

What happens in early embryo development day 1

A

formation of pronuclei

60
Q

What happens in early embryo development day 2

A

first cell division

61
Q

What happens in early embryo development day 3

A

cell division continues

62
Q

What happens in early embryo development day 4

A

formation of morula

63
Q

What happens in early embryo development day 5

A

blastocyst forms

64
Q

Early embryo enters uterine cavity in what phase

65
Q

Trophoectoderm cells produce

A

Protease to dissolve zona

66
Q

Trophoblast of Blastocyst adheres to

A

Epithelial Layer of Maternal Endometrium

67
Q

Uterine Spiral arteries remodel the

A

Trophoblast

68
Q

Hatching of embryo from Zona Pellucida is when

A

5th Day after Fertilisation

69
Q

What is a pre-requisite for trophoblast invasion and placentation

A

Transformation of Stromal Cells under effect of Progesterone

70
Q

Stromal Cells are converted into

71
Q

What are uterine natural killer cells also known as

A

Decidual Leukocytes

72
Q

Trophoblast invades from

A

Primary Chorionic Villi

73
Q

Embryo development where blastocyst reaches is what day

74
Q

Embryogenesis happens when

A

First 8 Weeks of Embryo development post fertilisation

75
Q

Fertilised egg forms blastocyst when

76
Q

Bilaminar Germ and Amniotic Sac form when

77
Q

Yolk Sac is formed when

78
Q

Extraembryonic Mesoderm and Chorionic Cavity forms when

79
Q

Differentiation of Bilaminar Disc into Trilaminar Structure is when

80
Q

Organogenesis happens when

81
Q

Fetal Period Begins

82
Q

Bilaminar Disc consists of

A

Epiblast and Hypoblast

83
Q

Epiblast undergoes what to form three germ layers

A

Gastrulation

84
Q

Hypoblast forms

A

Extraembryonic Mesoderm

85
Q

Inner Layer Cytotrophoblast forms

A

Chorionic Villi

86
Q

What kind of epithelium in bilaminar epiblast

87
Q

What kind of epithelium in hypoblast

88
Q

The Yolk Sac forms on

89
Q

Amniotic Cavity forms on the

90
Q

Epiblast differentiates into

A

Ectoderm, Mesoderm and Endoderm

91
Q

Where does Primitive Streak appear from

A

Caudal Epiblast

92
Q

Which forms Endoderm

A

Epiblast Cells migrate into Hypoblast

93
Q

What forms Mesoderm

A

Epiblast Cells through Primitive Streak between Epiblast and Hypoblast/endoderm

94
Q

The Trilaminar Disc is also called

95
Q

The Ectoderm forms the (8)

A 
Epidermis
CNS
Peripheral Nervous 
Hair
Nails
Adrenal Medulla
Pituitary Gland
Teeth Enamel
96
Q

The Mesoderm forms the (9)

A 
Dermis
MSK
CVS
Kidneys
Ureters
Bladder
Gonads 
Adrenal Cortex
Pleura
97
Q

The Endoforms the (7)

A 
GI Tract
Parenchyma liver
Pancreas
Thyroid
Tonsils
Bladder
Urethra
98
Q

Intermediate Mesoderm forms

A

Kidney, Ureter, Gonads

99
Q

What happens in Dizygotic Pregnancy

A

Two or more eggs fertilising and implanting, non identical

100
Q

What happens in Monozygotic Pregnancy

A

One Embryo Splitting

Identical Twins

101
Q

In Day 1-4 Division Day Post Fertilisation Type of Pregnancy and Incidence

A

Dichorionic Diamniotic 20% (Seperate Placenta and Amniotic Sac)

102
Q

In Day 5-8 Division Day Post Fertilisation Type of Pregnancy and Incidence

A

Monochorionic diamniotic (share placenta, separate amniotic sac) 75%

103
Q

In Day 7-14 Division Day Post Fertilisation Type of Pregnancy and Incidence

A

Monochorionic monoamniotic (share placenta and amniotic sac) 5%

104
Q

In Day >14 Division Day Post Fertilisation Type of pregnancy and Incidence

A

Conjoined Twins <1%

105
Q

In Monozygotic Pregnancy what happens to Placenta

106
Q

Embryogenesis when

A

First 8 Weeks Post Fertilisation

107
Q

The caudal end of enfolded yolk sac is known as

108
Q

The Cloaca is divided by urorectal septum to form

A

Urogenital Sinus

AnaL Canal

109
Q

Urogenital Sinus forms

A

Bladder and Urethra

110
Q

The indifferent gonad develops in

A

Gonadal Ridge

111
Q

What forms Primitive Sex Cords

A

Epithelium of Gonadal Ridge

112
Q

Which chromosome contains SRY gene

113
Q

What forms Testis Cords

A

Primitive Sex Cords entering into medulla

114
Q

Leydig cells are produced from

A

Intermediate Mesoderm

115
Q

Leydig cells produce testotestone from

116
Q

Mesonephric Duct also called Wolffian Ducts drain

A

Mesonephros into Cloca

117
Q

What forms bladder

A

Mesonephric Duct also called Wolffian Ducts

118
Q

What forms the Labia Minora

A

Urogenital Folds

119
Q

What forms Labia Majora

A

Labioscrotal Folds

120
Q

What forms Clitoris

A

Genital Tubercle

121
Q

In females paramesonephric duct forms

A

Uterus and Upper 2/3rd of Vagina

122
Q

Lower 1/3rd of vagina forms form

A

Urogenital Sinus

123
Q

Mesonephric/Wolffian Duct develops under testosterone effect to form

A

Epididymis, Vas Deferens and Seminal Vesicles

Repro Anatomy (10 decks)

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