Embryology Flashcards
(34 cards)
Cells of the archenteron as defined as
Endoderm
What does the endoderm become?
Inner lining of the digestive tract and the respiratory tract
Blastomeres are not completely divided
Meroblastic (huge yolk)
A solid ball of cells
Morula
Mesoderm comes from areas around ___ in protostomes
blastopore
What does the inner cell mass become?
The embryo
Blastomeres are equal in size and completely divided
Holoblastic (low yolk)
Cells on the outside of the blastocyst?
Trophoblasts
Cells of a gastrula migrate in and form a pocket of cells called
Archenteron
zygote -> early cleavage -> late cleavage -> blastocyst -> embryonic plate -> primitive streak -> neural groove -> neural tube -> organ differentiation
Mammal path
“Everything else” Ex. Becomes muscle, cartilage, bone, blood…etc
Mesoderm
Embryonic cells / early embryonic cells
blastomere
__ becomes the outer covering of the animal
Ectoderm
-> late cleavage -> blastula -> gastrula -> yolk plug -> neural groove -> neural tube -> organ differentiation
Amphibian path
Mesoderm comes from out pockets of ___ in deuterostomes
archenteron
What does blastopore become for deuterostomes?
anus
What are the 5 embryology pathways
Non-chordates Primitive chordate Amphibian Bird/Reptile Mammal
Blastomeres are unequal in size and completely divided
Holoblastic (high yolk)
__ becomes the dorsal nerve if the animal has one
Ectoderm
-> gastrula -> neural groove -> neural tube -> organ differentiation
Primitive chordate path
Cells of a gastrula migrate in and form a hole called
Blastopore
Zygote -> early cleavage -> late cleavage -> blastula / blastocoel -> gastrula -> organ differentiation (larva)
Non-chordate path
What do Trophoblasts become ?
The embryo’s portion of the placenta
__ becomes the brain if the animal has one
Ectoderm
