Embryology Flashcards
(34 cards)
Triploblastic
Endoderm, ectoderm and mesoderm
__ becomes the brain if the animal has one
Ectoderm
Mesoderm comes from areas around ___ in protostomes
blastopore
Cells of a gastrula migrate in and form a pocket of cells called
Archenteron
Blastomeres are unequal in size and completely divided
Holoblastic (high yolk)
Cells on the outside of the blastocyst?
Trophoblasts
zygote -> early cleavage -> late cleavage -> blastocyst -> embryonic plate -> primitive streak -> neural groove -> neural tube -> organ differentiation
Mammal path
A solid ball of cells
Morula
blastodisk = ___ path
Bird / Reptile path
zygote -> early cleavage -> late cleavage -> blastodisk -> primitive streak -> neural groove -> neural tube -> organ differentiation
Bird / Reptile path
64 cells -> 128 cells (Too many to count)
late cleavage
What does blastopore become for protostomes?
mouth
What does the endoderm become?
Inner lining of the digestive tract and the respiratory tract
What are the 5 embryology pathways
Non-chordates Primitive chordate Amphibian Bird/Reptile Mammal
Resting phase for amphibian path?
yolk plug stage
“Everything else”
Ex. Becomes muscle, cartilage, bone, blood…etc
Mesoderm
-> late cleavage -> blastula -> gastrula -> yolk plug -> neural groove -> neural tube -> organ differentiation
Amphibian path
Cells of the archenteron as defined as
Endoderm
Difference between blastula and gastrula?
Formation of blastopore.
What does blastopore become for deuterostomes?
anus
Mesoderm comes from out pockets of ___ in deuterostomes
archenteron
__ becomes the dorsal nerve if the animal has one
Ectoderm
Zygote -> early cleavage -> late cleavage -> blastula / blastocoel -> gastrula -> organ differentiation (larva)
Non-chordate path
Blastomeres are equal in size and completely divided
Holoblastic (low yolk)
