Este test está cronometrado.
Tienes 20 minutos para completar 20 preguntas de este test.
The primitive streak develops in which layer of embryonic disc?
a. Epiblast.
b. Hypoblast.
c. Mesoderm.
d. Endoderm.
e. Notochord.
. Which of the following is derived from somites:
a. Dermis.
b. Ganglia.
c. Pleura.
d. Lungs.
e. Kidneys.
An umbilical cord attached to the margin of placenta is called:
a. Velamentous insertion of cord.
b. Placenta accreta.
c. Battledore placenta.
d. Succenturiata placenta.
e. False cord knot.
The number of somlres during the 22nd day is:
a. Two.
b. Four.
c. Seven.
d. Ten.
e. Thirteen.
Nucleus pulposus of intervertebral disc develops from the:
a. Neural crest.
b. Notochord.
c. Sclerotome.
d. Somite.
e. Ectoderm.
The arteries. veins and lymphatic channels develop from:
b. Ectoderm.
d. Amnion.
e.Endoderm.
Amniotic cavity is temporarily connected to yolk sac cavity via:
a. Breakdown of oral membrane.
b. Allantois.
c. Neurenteric canal.
d. Vitello-intestinal duct.
e. Breakdown of cloaca! membrane.
All the following are parts of the intraembryonic mesoderm EXCEPT:
a. Sclerotome
. b. Intermediate cell mass.
c. Dermatome.
d. Lateral plate mesoderm.
e. Connecting stlak.
. Mesoderm is absent in:
a. Somites.
b. Oral membrane.
e. Dermomyotomes.
c. Nephrogenic cord.
d. Sclerotomes.
Which of the following abnormalities of the placenta is due to an abnormality in implantation?
a. Battledore placenta.
b. Accessory placenta.
c. Bipartite placenta.
d. Placenta praevia
e. Tripartite placenta
As regards the twins, choose the INCORRECTstatement:
a. They may be monozygotic or dizygotic.
c. Monozygotic twins have always identical sex & blood groups.
b. Conjoint twins are dizygotic twins.
d. Dizygotic twins may have identical sex & blood groups.
e. Monozygotic twins may have 2 amniotic sacs.
The Intervillous spaces contain:
a. Foetal blood.
b. Maternal blood.
c. A mixture of foetal & maternal blood.
d. Blood with high C02 content.
e. Blood with low 02 content.
At the caudal end of the primitive streak, ectoderm & endoderm meet at the:
a. Notochordal canal.
b. Cloaca! membrane.
c. Buccopharyngealmembrane.
d. Intraembryonic coelom
e. None of the above.
) All of the following are derivatives of the surface ectoderm except:
(A) The skin and its appendages.
(B) The lining of all orifices of the body that open into the skin.
(C) The nervous tissue & the pituitary gland.
(D) Adrenal medulla.
(E) Muscles of the iris.
(F) Muscles of the limbs.
) All of the following anomalies might be fatal to the embryo except:
(A) Too long umbilical cord.
(B) True knot of the umbilical cord.
(C) False knots of the umbilical cord.
(D) All of the above
Regarding the amnion, all of the following are true except:
(A) Amniotic cavity contains watery fluid.
(B) Hydroamnios may be due to esophageal atresia
(C) Oligohydraminos may be due to renal agenesis (Failure of formation of the kidneys).
(D) It prevents fetal movements.
All are the contents of the umbilical cord at birth except:
(A) 2 Umbilical arteries.
(B) 1 Umbilical veins.
(C) Wharton’s jelly.
(D) Allantois & vitellointestinal duct.
Down’s syndrome is due to:
(A) Triasomy of the chromosome 14.
(B) Triasomy of the chromosome 18.
(C) Triasomy of the chromosome 21.
(D) Triasomy of the chromosome 23.
chromosomal formula of turner syndrome is
44 +y
45+x
44+x
46+x
44+xxy
The visceral layer of the lateral plate mesoderm forms which of the following: (
A) Muscles of the limbs.
(B) Anterolateral body wall muscles.
(C) Smooth muscles of the viscera (GIT).
dermis of the skin