embryology jeopardy questions Flashcards
At age 6, all future gametes in the testis are?
primordial germ cells
What is the cell that leaves the ovary called?
secondary oocyte – arrested in metaphase 2
Development of the primitive gonads into testes or ovaries is induced by invasion of the developing gonads by the primordial germ cells. The cells migrate from which of the following locations?
Yolk sac
During oogenesis, when would all the primary oocytes be expected to enter meiosis 2?
During the 5th month of development
Fertilization normally occurs at which location?
Ampulla (distal end of the uterine tube)
What event would indicate that fertilization has taken place?
Formation of the second barr body at the end of meiosis 2 (no longer arrested in metaphase 2)
If you were trying to design a contraceptive agent targeting the ability of spermatozoa to fertilize an ovum, what possible avenue could you take?
Develop an agent that blocks the spermatozoa cell-surface receptors to the zona pellucida
During the first week of development, there was a failure of the blastocyst to begin implantation, what might have caused this?
Breakdown of the zona pellucida
A 28-year-old woman who does not know she is pregnant undergoes a chemotherapy treatment at the end of her first week of pregnancy. This particular chemotherapy treatment is associated with slowing the rate of development in exposed cells, which is good in cancer treatment. However, this treatment may also have a negative influence on the implantation and growth of an embryo – which layer would a slowed rate of development most likely hinder implantation?
Synctiotrophoblast
The amniotic cavity forms within what structure?
Epiblast
Lacunar Networks develop within what during the second week?
Synctiotrophoblast
What do primary villi develop from?
Cytotrophoblast
What produces hCG?
Synctiotrophoblast of the placenta
Primordial blood cells of the 3 week embryo first begin to form where?
In the yolk sac
Which tissue or structure is responsible for synthesizing and secreting progesterone until the placenta takes on this role?
Corpus Luteum
In a day 15 embryo, what cell lines can the epiblast form?
Ectoderm, mesoderm, endoderm
What are the components of the definitive chorion?
extraembryonic somatic mesoderm, cytotrophoblast, and synctiotrophoblast
What happens in gastrulation?
Embryo connects to uterus by umbilical cord; Blastula fold onwards and the 4 layers form – primitive steak forms along the caudal half of the dorsal midline axis of the embryo
what does the hypoblast give rise to?
Heuser’s Membrane
What is Kartagener syndrome?
Inherited defect of dynein arm, which is necessary for ciliary movement.
Associated with sinusitis, infertility (poor motility of sperm), situs inversus – increased risk of ectopic pregnancy
