During which period is the embryo most susceptible to environmental influences that could induce the formation of nonlethal congenital malformations?

The fourth through eighth week of fetal life

The third month of fetal life

Fertilization to one week of fetal life

The second and third week of fetal life

The third trimester of fetal life

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A 10-14 % of newborn suffer from developmental anomalies. Which embryonic origin urinary system develops?

Intermediate mesoderm

Dorsal mesoderm

Visceral layer of ventral mesoderm

Parietal layer of ventral mesoderm

Mesenchyme

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Slow healing of an umbilicus is caused by patent primitive urinary duct - urachus. Which embryonic origin are urinary bladder and urachus develop from?

Allantois

Cloaca

Urogenital sinus

Paramesonephric duct

.Mesonephric duct

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At early stages of embryos development appear a finger-like diverticulum of a yolk sac which grows in connecting stalk. What name has this fetal membrane?

Allantois

Amnion

Placenta

Umbilical cord

Yolk sac

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On a microslide of a cross section of an organ that is formed by the mucous connective tissue, two arteries and a vein is introduced. What is the organ on microslide?

Umbilical cord

Yolk sac

Amnion

Allantois

Placenta

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On microslide of the bulb of the fetus eye a damage of a cornea is observed. Part of what germ layer has been struck during embryonic development

Ectoderm

Mesoderm

Endoderm

Dermatome

Nephrotome

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During an embryogenesis there was a breaking shaping of a pharyngeal gut. Specify possible localization of anomalies of development?

Organs of an oral cavity.

A stomach

An ileum

A pancreas

A jejunum

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Women was ill by flu on the 7-14 days of pregnancy. In which of the following structures may be development of pathologic changes?

Breach of ecto- and endordermal formation

Breach of mesenchyme formation

Breach of mesordermal formation

Breach of the process of epibole

Breach of the process of invagination

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As the result of acrosomal reaction lack the destruction of junctions between oocyte granulosa cells did not occur under fertilization. What process was broken?

Denudation

Capacitation

Cortical reaction

Zona reaction

Determination

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It was determined compression of the fetus umbilical cord, but it was not destroyed blood circulation between fetus and mother. Presence of what structures cause this process?

Wharton's jelly

.Layer of artery

Layer of vein

Allantois

Yolk sac stalk

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A metaphase-blocking dose of colchicines works by which of the following mechanisms

.Inhibition of tubulin polymerization

Depolymerization of myosin

Enhancement of tubulin polymerization

Depolymerization of actin

Binding to and stabilizing microtubules

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Compression of umbilical cord took place. But blood circulation between fetus and maternal organism happened normally. What morphologic components of the umbilical cord promoted to this?

Mucuous tissue

Allantois residue

Tunic of umbilical arteries

Tunic of umbilical vein

Yolk sac residue

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There is connecting with the gut vesicle is visible on the histologic micropreparation. It is an extraembryonic organ. Primordial germ cells and erythroblasts (megaloblasts) are located in its wall. What organ is this?

Yolk sac

Allantois

Placenta

Umbilical cord

Amnion

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Destruction of neural crest took place in embryo after bacterial toxins influence. What element development will be absent in this case?

C-cells, pigment cells, suprarenal medulla

Myocardium, epicardium

Kidney, ureter

Skin dermis

Gastric and intestinal epithelium

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The prechordal plate is origin of development of the future epithelium of

esophagus

.heart

umbilical cord

anus

nose

1

After two months of appendectomy the patient again has arrived in surgical department with the diagnosis: «The intestinal obstruction, an adhesive disease». During operation damage of what epithelium covering a peritoneum has reduced in development of adhesive disease?

Mesothelium

Endothelium

Transitional epithelium

Simple columnar epithelium

Simple cuboidal epithelium

2

2