embryonic period weeks 38 Flashcards Preview

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Flashcards in embryonic period weeks 38 Deck (11):
1

What happens during the 3dr to 8th week of development of the previous 2 layer embryo ? And how is the process called ?

Transforms into a 3 layer embryo, process called gastrulation

2

Which are the 3 layers of the embryo ?

Ectoderm
Endoderm
Mesoderm

3

What is the primitive streak and its function ?

Its an aperture in the epiblast that lets cells go from the epiblast and form the central mesoderm and notochord and replace hypoblast cells to create the endoderm

4

The ectoderm gives rise to ?

1) surface ectoderm
2) Neuroectoderm
3) Neural crest cells

5

Durig which period of development does major system and organs start to develop ?

weeks 3-8

6

A sacrococcygeal teratoma is ?

A tumor from remnant of the primitive streak , with multiple tissues

7

The tumor derived from remnants of the notochord is called ?

Chordoma

8

A partial Hydatidiform mole develops

From the union of two spermatozoa with one ovum, creating a 69 xxy triploidy

9

A complete mole develops from the union of ?

one spermatozoa with an empty ovum
all the material from the father will reduplicate and produce a cell 46 XX but with only paternal chromosomes

10

What percentage of patients with an Hydatidiform mole can develop an malignant trophoblastic disease ?

20 %

11

How are the levels of hCG in a patient with hydatidiform mole ?

High