Embryo lab Qs!!!! Flashcards
Give the definition of gastulation
The creation of 3 somatic germ layer - ectoderm, mesoderm, endoderm
What is the main difference between invasion and non invasion placenta
The degree of contact between the fetal tissue and the uterine
Adeciduate-non invasive- there is no fusion of the maternal and fetal tissue, and separation is easily achieved at parturation without damage to maternal tissue. In Horses, pigs and ruminants. Eg. diffuse and cotyledonary placentae.
Deciduate-invasive : The intimate connection between foetal tissue and uterine. Some maternal tissue is lost with the foetal tissue at birth. In carnivores, humans and rodents eg zonary and diffuse placentae.
Name placenta of pig based on surface of chorion
Diffuse placenta (also in Horses)
List all phases of prenatal/ embryo development
What is diapause
The blastocyst enters a period of decreased cell division and metabolic slow down
List the germ layers in logical sequence
Ectoderm, mesoderm, endoderm
In which state meioitic division of cell cycle is the oocyte ovulated in most mammals
Metaphase 2
Name the last stage of embryo development that contains solid cell mass, without any cavity
Morula
Which organelle changes into acrosome
Golgi apparatus
List all fetal membrane
!!!!!!!!!!!!NB VERY IMPORTANT FOR FINAL!!!!!!!
Yolk sac,
Amnion
Allantois
Chorion
(order is important)
what is the difference between gastrulation and organogenesis
Gastrulation is the creation of 3 somatic germ layer - ectoderm, mesoderm, endoderm
Organogenesis is the creation of final organism
what does CRL mean
Crown-rump length
List all phases/ steps of implantation
1.Centric or superficial implantation
2.Interstitial mesometrial implantation OR Interstitial antimesometrial implantation
3.Eccentric anti-mesometrial implantation
type of placenta of dog based on surface of chorion
Zonary placenta
Name the placental barrier in pig !!
1.Maternal endothelium vessels
2.Maternal connective tissue
3.Maternal epithelium
4.Fetal epithelium = trophoblast
5.Fetal connective tissue
6.Fetal endothelium vessels
