germination (poultry and mammals)

another name for cleavage

segmentation

what are the first divisions in gastrulation

1) segmentation
2) morulation
3) blastulation

what is the difference between division in poultry and mammals?

mammals: complete (holoblastic)
poultry: incomplete (meroblastic)

the morulation phase only occurs in ___

mammals

what is the morulation phase?

there are now 16+ cells that are compacting

what is the product of meroblastic division in poultry?

blastoderm

what is the first cavity that forms in the blastoderm?

subgerminal cavity

two layers that surround the subgerminal cavity?

area opaca (develops into extra embryonary structures) and area pellucida (develops into animal)

what forms during blastulation in both mammals and poultry?

the embryonic layers- epiblast, hypoblast, blastocoel, subgerminal cavity

what is the product of blastulation called in mammals?

blastocyst

what is the product of blastulation called in poultry?

blastoderm

where is the blastoderm located?

on the surface of the yolk

structure of uterus

uterine neck (yellow)

unterine horns (green)

ovaries (blue)

oviduct (pink)

what is the sub germinal cavity

separates the yolk and blastomeres

poultry blastulation

difference between morula and compact morula

what is the first specialisation period

blastulation

what are trophoblasts

cells forming the outer layer of a blastocyst, which provides nutrients to the embryo

why is zona pelucida preserved until the end of blastulation?

to protect cell division

blastocyst hatching

degradation of the zona pellucida overlying the inner cell mass

at the end of germination, blastocyst must be placed at the ____

uterine horn