T — embryogeneis Flashcards
Where does fertilization happen?
a) Ovary
b) Ampulla of fallopian tube
c) Uterus
d) Cervix
b
What does the inner mass of the blastocyst differentiate into?
a) Ectoderm & mesoderm
b) Hypoblast & epiblast
c) Chorion & amnion
d) Endoderm & ectoderm
b
What does the trophoblast differentiate into?
a) Cytotrophoblast & syncytiotrophoblast
b) Ectoderm & mesoderm
c) Endoderm & epiblast
d) Amnion & chorion
a
What forms the three germ layers?
a) Epiblast
b) Trophoblast
c) Hypoblast
d) Mesoderm
a
What are the three germ layers?
a) Endoderm, mesoderm, ectoderm
b) Ectoderm, epiblast, hypoblast
c) Endoderm, ectoderm, synctiotrophoblast
d) Amnion, chorion, yolk sac
a
At what stage of the egg does sperm fertilize?
a) Primary oocyte
b) Secondary oocyte
c) Zygote
d) Blastocyst
b
What is the acrosomal apparatus?
a) A structure formed by the fertilized egg
b) A tubelike structure formed when sperm first makes contact with the secondary oocyte’s membrane
c) The outermost layer surrounding the embryo
d) A membrane around the sperm head
b
What does the acrosome do?
a) Provides energy for sperm motility
b) Reaches the zona pellucida
c) Releases hydrolytic enzymes to penetrate the corona radiata & zona pellucida
d) Induces the cortical reaction
c
What reaction happens after sperm enters the oocyte?
a) Cortical reaction
b) Fertilization reaction
c) Embryonic reaction
d) Cytoplasmic reaction
a
What do monozygotic twins share?
a) Amnion & chorion
b) Placenta & yolk sac
c) Embryonic tissue only
d) Only the placenta
a
What is cleavage in embryology?
a) The process of cell differentiation
b) Rapid mitosis as the zygote moves from the oviduct to the uterus
c) Formation of the three germ layers
d) The final stage of egg development
b
What is the chorion?
a) The innermost layer of the embryo
b) The layer surrounding the blastocyst
c) The outermost layer surrounding the embryo; it forms the fetal part of the placenta
d) The membrane around the embryo’s amniotic cavity
c
During which process are the three germ layers formed?
a) Cleavage
b) Fertilization
c) Gastrulation
d) Neurulation
c
What does the neurula form?
a) The embryonic tissue layers
b) The neural tube from ectoderm to form the CNS
c) The placental structures
d) The trophoblast
b
When is the zygote called a fetus?
a) At fertilization
b) At the 8th week
c) At implantation
d) At the 9th week onwards
d
