Embryo

Question 1

blastocyst layers???(remake this card)

Answer 1

hypoblast
blastocyst cavity
epiblast
amnioblasts
synctiotropoblast
cytotrophoblast
amniotic cavity

(in no particular order)

Question 2

what happens in week 2 of embryonic development

Answer 2

2 cavities.
amniotic cavity above
blastocyst cavity below

Question 3

completition of impalantation.
(7th-12th days)

Answer 3

7th day.
trophoblast into cyto and synctio trophoblast
[adherence and penetration]

10th day
fibrin coagulum

12th day
regeneration of uterine eputhelium
(complete embedded in stroma)

Question 4

embryoblast
bilaminar germ disc

Answer 4

8th week

Question 5

trophoblast

Answer 5

divides into cytio and syntiotropho

cytio layer of minonucleared cells
syntio lacunae 9th day

Question 6

2 layers formed

Answer 6

epiblast above
hypoblast below

Question 7

how is chorion made

Answer 7

Extraembryonic somatopleuric mosoderm AND 2 layers of trophoblast, cyto and synctio forms the chorion.

Question 8

chromosomal abnormalities due to;
1. nondisjunction(define and name)

whats translocation

Answer 8

NON DISJUNCTION: failure of chromosome seperation

1. trisomy 21(down syndrome): extra chromosome 21.
   growth retard, craniofacial abnorms
2. trisomy 18(edward syndrome)
   mental retard, heart defects
3. trisomy 13(patau syndrome)
   mental retard, heart defects, cleft lip
4. 45X (Turners syndrome)
   only monosomy compatible with life.
5. XXX syndrome
   infantile with scanty menses

translocation: piece of chromosome moves to another

Question 9

What is the notochord

Answer 9

prenotochondral cells invaginate into primitive node.
makes notochord.

Question 10

Neuruolation
3rd-4th weel

Answer 10

Neural plate
induction by notochord
neural groove forms
neural folds are formed