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Undeleted > Early development > Flashcards

Early development Flashcards

1
Q

Zygote

A

Morula?

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2
Q

Blastomere

A

Newly fertilized ovum after mitotic divisions

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3
Q

Compaction

A

?

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4
Q

Morula

A

Compacted balstomeres - a.k.a zygote

Enters uterus, 3rd/4th day after fertilization

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5
Q

Blastocyst

A

Morula that has entered uterus

has a cavity, and inner (future embryo) and outer layers (trophoblast)

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6
Q

Trophoblast

A

Outer cell layer of blastocyst

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7
Q

Bilaminar germ disc

A

?

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8
Q

CLeavage

A

Mitotic Divisions

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9
Q

Gastrulation

A

development of ecto, endo, meso derm from epiblast

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10
Q

Ectoderm = forms what

A

Neural plate - nervous system,
Primitive Spinal cord
**sensory epithelium all over body outside body

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11
Q

Mesoderm = forms what

A

Somites
=Vertebral Column & Tendons/Cartilage/Bone
=Muscle
=Connective Tissue
Urogential Structures
Lining of intraembryonic Cavity and organs

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12
Q

Primordial Germ Cells - location

A

Wall of Yolk Sac

migrate to Gonadal Ridge

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13
Q

Fertilization preparation

A

Spermatozoon must penetrate corona radiata, zona pellucida and oocyte cell membrane

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14
Q

Fertilization result

A

Restoration of diploid number of chromosones, determination of sex and intiation of cleavage

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15
Q

Fertilization location

A

ampulla of uterine tube

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16
Q

Implantation

A

Blastocyst implanted within uterine cavity

help from throphoblast cells

17
Q

Ecpotic pregnancy

A

implantation of blastocyst outside uterine cavity

18
Q

Thropholbast devenpolment

A

turns into cytothrophoblast and synctiothrophoblast that grow into endometrium

19
Q

Gastrulation process

A

begins with formation of primitive streak on dorsal srface of epiblast
cells of epiblast migrate toward primitive streak and form endoderm
Other cells btwn epiblast and endoderm form mesoderm
Remaining cells for ectoderm

20
Q

Trilaminar disc

A

3 distinct germ layers

ectoderm, mesoderm, endoderm

21
Q

Notochord

A

Extends from primitive node to oropharyngeal membrane and plays an inductive role in organ formation

22
Q

Embryonic disc

A

flat rounded sturcture, undergoas folding to form body cavities

23
Q

Nerurulation

A

notochord induces ectoderm to thicken and form neural plate (neuroectoderm)

24
Q

neuroectoderm

A

Gives rise to spinal cord

25
Q

Neural crest cell

A

migrate through embryo to form adult structures

26
Q

Any interuption in mitosis or migration of neural cells can proiduce developmental defect. KNOW

A

KNOW

27
Q

Mesoderm - layers

A

Paraxial, Intermediate and Lateral plate mesoderm

28
Q

Endoderm

A

GI tract, Respiratory tract lining, parenchyma, stroma, lining bladder, urethra +

Undeleted (45 decks)

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