Development

Front 1

Ectoderm

Back 1

Outermost layer (blue)

Front 2

Mesoderm

Back 2

Middle layer (red)

Front 3

Endoderm

Back 3

Inner most layer (green)

Front 4

Somatic body wall of tripioblastic embryo

Back 4

Ectoderm + somatic mesoderm

Front 5

Splanchnic body wall of tripioblastic embryo

Back 5

Visceral mesoderm + endoderm

Front 6

Epiboldy

Back 6

cells flow over yolk

Front 7

Involution

Back 7

cells feed from upper and lower ridges into blastocoel

Front 8

Formation of DHNC

Back 8

neural plate folds over to form hollow tube

Front 9

Formation of notochrod

Back 9

Middorsal chordomesoderm forms rod

Front 10

Formation of gut

Back 10

endoderm closes over to form tube

Front 11

Formation of coelom

Back 11

two methods: enterocoely or schizocoely

Front 12

Eneterocoely

Back 12

mesoderm pockets pinch off of gut to form coelom

Front 13

Schizocoely

Back 13

Block of solid mesoderm splits to form coelom

Front 14

Meroblastic clevage

Back 14

unequal rates of cleavage in animal pole/blastoderm (fast) vs vegetal pole (slow)

Front 15

Archenteron

Back 15

first manifestation of the gut

Front 16

Somatopleure

Back 16

ectoderm + somatic mesoderm

Front 17

Splanchnopleure

Back 17

Splanchic mesoderm + endoderm

Front 18

Folds of somatopleure produce

Back 18

Amnion (inner double layer) and Chorion (outer double layer)

Front 19

Lining of splanchnopleure produces

Back 19

Yolk sac

Front 20

Amnion

Back 20

ectoderm + somatic mesoderm=Somatopleure

recreates aqueous environment

innermost extraembryonic membrane

Front 21

Allantois

Back 21

endoderm + ventral mesoderm

collects embryonic waste, allows gas exchange

Front 22

Chorion

Back 22

ectoderm + somatic mesoderm=somatopleure

contacts shell and facilitates gas exchange

outermost extraembryonic membrane

Front 23

Yolk sac

Back 23

splanchnic mesoderm + endoderm=splanchnopleure

holds embryonic nutrients

Front 24

Placenta

Back 24

Maternal tissue + chorion + allantois

Front 25

Hypoblast

Back 25

Inner section of blastoderm, derived from endoderm

Front 26

Epiblast

Back 26

Outer section of blastoderm, derived from ectoderm?

Front 27

Primitive streak

Back 27

origin of mesoderm in macrolecithal egg

Front 28

Somites

Back 28

bilaterally paired blocks of paraxial mesoderm which are representative of vert muscle segments

Front 29

Diploblastic Acoelomate

Back 29

Ectoderm

Endoderm

Gut

Front 30

Tripioblastic Acoelomate

Back 30

Ectoderm

Mesoderm

Endoderm

Gut

Front 31

Tripioblastic Coelomate

Back 31

Ectoderm

Mesoderm

Coelom

Endoderm

Gut

Front 32

Blastopore in Deuterostomes becomes

Back 32

Anus

Front 33

Blastopore in Protostomes becomes

Back 33

mouth

Front 34

Hensen's Node/Primitive knot

Back 34

Organization area for grastulation

Front 35

Epimere

Back 35

Dorsal section of mesoderm

gives rise to dorsal skeletal structures

Front 36

Components of Epimere

Back 36

Dermatome

Sclerotome

Myotome

(together make a somite)

Front 37

Dermatome

Back 37

Section of epimere ("skin slice")

dermis= inner skin layer

bones in dermis= dermal bones

Front 38

sclerotome

Back 38

Section of epimere ("hard slice")

vertebra and ribs

Front 39

Myotome

Back 39

Section of epimere ("muscle slice")

muscles of outer body wall

(most of epimere derivatives)

Front 40

Mesomere

Back 40

Middle section of mesoderm

gives rise to urogenital system

Front 41

Hypomere

Back 41

Ventral piece of mesoderm

surrounds coelom

many diverse derivatives