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Lab Exam > Embryology > Flashcards

Embryology Flashcards

1
Q

What are the four dimension embryology takes place in

A

Space - 3D

Time

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2
Q

Embryo

A

Until the end of 8th week

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3
Q

Zygote

A

2 cell stage to morula

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4
Q

Morula

A

Day 3

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5
Q

Blastocyst

A

Days 4-6

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6
Q

Fetus

A

Week 9 to birth

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7
Q

Ovum

A

Mature unfertilized egg

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8
Q

Conceptus

A

all structures that develop from zygote

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9
Q

Oocytes

A

Complete first meiotic division
Arrest at Metaphase of meiosis II
Haploid chromosome
All created before birth

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10
Q

Zones of Ovum

A

Nucleus
Zona Pellucida
Corona Radiata

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11
Q

Uterine Tube Mucosa

A

Peg cells - nutritive ovum material

Ciliated cells - move fluid

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12
Q

Ovum viability

A

~24 hours

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13
Q

Sperm anatomy

A

Head with acrosomal cap
Mitochodrial sheath
Tail
Haploid number of chromosomes

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14
Q

Epididymis

A

Where sperm gain motility and are stored

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15
Q

Average amount of ejaculate

A

2-6ml

200-600million sperm

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16
Q

Sperm who actually make it to oviduct

A

A few hundred

17
Q

Sperm viability

A

24-48 hours

18
Q

Fertilization

A

Takes 24 hours
Use hyaluronidase and tube enzymes to penetrate Corona Radiata
Wag tail clockwise
Penetration of Zona Pellucida activated zona reaction
Ovum completes Meiosis II and sperm mitochondria are destroyed

19
Q

Results of Fertilization

A 
Initiates Meiosis II
Restoration of Diploidy
Determines Sex
Activated Metabolism
Initiates Cleavage
20
Q

Four days after fertilization

A

Inner cell mass and blastocyst have formed
Will float down Fallopian tube two more days
Implants in endometrium at six days

21
Q

Decidua reaction

A

Creates syncytiotrophoblast and cytotrophoblast

Syncytiotrophoblast merges with vessels and glands of endometrium for nutrition

22
Q

Epiblast

A

Only thing that becomes embryo
Forms ectoderm and amnion
Extraembryonic ectoderm
Primitive Streak

23
Q

Hypoblast

A

Forms extraembryonic endoderm of yolk sack

24
Q

Gastrulation

A

Begins embryonic period at week 3

25
Q

Primitive streak

A

Proceeds from caudal to cranial and determines directionality of body

26
Q

Notochord

A

Ectoderm
Induces formation of neural plate
Involutes at top of primitive streak

27
Q

Outcomes of embryo folding

A

New cell relationships
New inductive influences
Everything but umbilicus closed
Directionality of embryo

28
Q

Differential growth

A

Some areas grow much faster than others

29
Q

Ectoderm Derivatives

A 
Hair 
Epidermis
Vestibular and Anal Lining
CNS
PNS
30
Q

Mesoderm Derivatives

A

Skeleton
Skeletal Muscle
Dermis

Lab Exam (12 decks)

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