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Flashcards in Early development Deck (28):
1

Zygote

Morula?

2

Blastomere

Newly fertilized ovum after mitotic divisions

3

Compaction

?

4

Morula

Compacted balstomeres - a.k.a zygote
Enters uterus, 3rd/4th day after fertilization

5

Blastocyst

Morula that has entered uterus
has a cavity, and inner (future embryo) and outer layers (trophoblast)

6

Trophoblast

Outer cell layer of blastocyst

7

Bilaminar germ disc

?

8

CLeavage

Mitotic Divisions

9

Gastrulation

development of ecto, endo, meso derm from epiblast

10

Ectoderm = forms what

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

11

Mesoderm = forms what

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

12

Primordial Germ Cells - location

Wall of Yolk Sac
migrate to Gonadal Ridge

13

Fertilization preparation

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

14

Fertilization result

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

15

Fertilization location

ampulla of uterine tube

16

Implantation

Blastocyst implanted within uterine cavity
help from throphoblast cells

17

Ecpotic pregnancy

implantation of blastocyst outside uterine cavity

18

Thropholbast devenpolment

turns into cytothrophoblast and synctiothrophoblast that grow into endometrium

19

Gastrulation process

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

Trilaminar disc

3 distinct germ layers
ectoderm, mesoderm, endoderm

21

Notochord

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

22

Embryonic disc

flat rounded sturcture, undergoas folding to form body cavities

23

Nerurulation

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

24

neuroectoderm

Gives rise to spinal cord

25

Neural crest cell

migrate through embryo to form adult structures

26

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

KNOW

27

Mesoderm - layers

Paraxial, Intermediate and Lateral plate mesoderm

28

Endoderm

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