fertilisation to trilaminar Flashcards
what does the sperm bind with
zona pellucida glycoprotein - zp3
what happens when sperm binds
acrosomal enzymes are released from sperm head and sperm digests its way in
what happens once sperm is in egg
egg and sperm plasma membrane fuse and sperm contents enter the egg
what does sperm entry tirgger
completion of meiosis 2
where does fertilisation occur
ampulla of uterine tube
totipotent
up to 8 cell stage
what does the zygote subdivide into
blastomeres
mosaicism
individuals with two or more cell line with idfferent chromosome complemetns
morula
16+ blastomeres
where does implantation occur
posterior or anterior uterine wallwh
what day does implantation occur
day 6
day 7.5
bilaminar embryo
trophoblast divides
what does the trophoblast divide into
cytotrophoblast and synctiotrophoblast
what does the embryo organise into
epiblast and hypoblast
day 9
formation of amniotic cavity and primitive yolk salc
primitive yolk sac
hypoblast
amniotic cavity
epiblast
what day is implantation complete
day 9
gastrulation
formation of 3 primary germ layers
gastrulation
cells migrate through the primitive streak between the epiblast and definitve endoderm
embryo transforms from a one-dimensional layer of epithelial cells, a blastula, and reorganizes into a multilayered and multidimensional structure called the gastrula
what is derived from ectoderm
epidemris of skin
nervous system
mesoderm
divided into 3 regions
axial skeleton, skeletal muscle and parts of back
intermediate mesoderm
urogenital systems
lateral plate mesoderm; somatic
most of dermis
, linig of body wall
parts of limbs
lateral plate mesoderm; visceral
cdv system, mesothelial covering of organs, smooth muscle
fate of endoderm
Lining of the gut tube
Lining of respiratory tract
Lining of the bladder and urethra
