Fertilisation Flashcards
Outer Shell Membrane
Thin Albumen
Thick Albumen
Nucleus
Air Sac
Chalaza
Oocyte Membrane (Not normally visible)
The Four Estrus Cycles
Monoestrus (Fox/Bear)
Polyestrus (Menstrual Cycle, humans)
Seasonally Polyestrus (Long/short day breeders)
Diestrus (Twice a year)
Magnum/Ampulla
Isthmus
Infundibulum
Give the 7 Stages of Fertilisation
- Acrosome Reaction
- Acrosome binds with zona pellucida
- Membrane Binding
- Cortical membranes fuse with Oocyte membrane
- Cortical Reaction
- Hardened Zona Pellucida
- Polyspermy Block
What is Cleavage?
Repeated mitotic division, forming blastomeres.
As they build, they form a morula and eventually a Blastula.
Give the four planes of cleavage.
Meridional
Vertical
Equatorial
Lattitudinal
What is happening in this diagram?
The Blastocyst is hatching from the zona pellucida and is embedding itself into the endometrium.
1
Mesoblast
6
Hypoblast
5
Lacunae
7
Heuser’s Membrane