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Embryology – the study of the development of embryo (from fecundation to birth) Quiz

Embryology – the study of the development of embryo (from fecundation to birth) Quiz Test

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Quiz Questions And Answers

All of the following structures are necessary for blastocyst implantation EXCEPT?

Endometrium in progestational phase
Zona pellucida
Syncytiotrophoblast

Mesoderm is formed from

Hypoblast cells
Extraembryonic ectoderm
Notochordal cells
Epiblast cells

Which of the following statements regarding the uteroplacental circulation is CORRECT?

Lacunae form within the cytotrophoblast
Hydrolytic enzymes produced by the trophoblast degrade the endothelium of embryonic capillaries
It is established during the second week of development

Between which two layers is the extraembryonic mesoderm located?

Exocoelomic membrane and cytotrophoblast
Epiblast and hypoblast
Syncytiotrophoblast and endometrium

Which of the following statements regarding the epiblast is CORRECT?

It is composed of small cuboidal cells
It forms the roof of the blastocyst cavity
It forms the primitive streak

The process of gastrulation is first indicated by the formation of the

Prechordal plate
Cloacal membrane
Primitive streak

True or false? Intraembryonic mesoderm is located between the endoderm and ectoderm at the buccopharyngeal membrane but not the cloacal membrane.

True
False

A newborn presents with craniofacial abnormalities and a cardiac defect involving the outflow tract of the heart. Why are you not surprised?

Paraxial mesoderm contributes to formation of both areas
HOX genes contribute to both areas and could be involved
Body folding is important for both areas and may produce combined defects
Neural crest cells contribute greatly to development of both regions

Which of the following is NOT derived from ectoderm?

Epidermis
Enamel of teeth
Dermis of skin

If an embryo failed to form the mesoderm germ layer which of the following would not develop?

Hindbrain
Schwann cells
Aorta
ANSWERS

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