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L9 , 3rd,4th week of pregnancy , embryology

 Lecture video Part 1





Part 1 data


Lecture video Part 2



Part 2 data


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mcq of part 1



1-The chorion consists of 

A-syncytiotrophoblast
b-Cytotrophoblast
 c-Extraembryonic mesoderm 
d-All of the above
 e-a +b only 

2-The chorionic vesicle has the following characters except

A-Its wall consists of three layers
 b-It contains three cavities 
c-One of these cavity is called blastocele
d-The embryonic disc is bilaminar 
e-Formation of extraembryonic mesoderm

3-The neuroenteric canal communicates

 A-Intraembryonic coelom with extraembryonic coelom
 b-Intraembryonic coelom with amniotic cavity 
c-amniotic cavity with the yolk sac
 d-Yolk sac with midgut 
e-Yolk sac with extraembryonic coelom

4-The gastrulation is the process of formation of

 A-Extraembyonic mesoderm 
b-Intraembryonic mesoderm
 c-Gut 
d-All of the above 

Answer of Part 1

1-d
2-c
3-c
4-b


mcq of part 2


1-The intraembryonic mesoderm spreads between the ectoderm and mesoderm except at 

 a-Buccopharyngeal membrane
 b-Cloacal membrane 
c-Cardiogenic plate
 d-All of the above
 e- a +b on

2-The cells of sclerotome give 

 A-Fibroblasts
 b-Chondroblasts 
c-Osteoblasts 
d-All of the above
 e- b+ c only


3-Which of the following does not arise from intermediate mesoderm

A-Kidney
 b-Testis 
c-Ovary
 d-Male genital ducts 
e-vertebrae

4-At the cranial end of notochord , the endoderm fused with ectoderm to form

a-Cloacal membrane
 b-buccopharyngeal membrane
 c- Primitive node
d-Primitive streak
 
5-The myotomes form 

 A-Muscles of the trunk
 b-Muscles of limbs 
c-Muscles of the face 
d-All of the above 
e- a + b only

Answer of Part 2


1-d
2-d
3-e
4-b
5-d



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