Bio Lab 122 Experiment 1

Front 1

Allantois

Back 1

the set of extraembryonic membreans that develops in some vertebrate embyros. The chick it serves to moves nitrogenous wastes and calcium to form the skeleton.

Front 2

amnion

Back 2

the extraembryonic membrans that surrounds the developing embryo in a fluid-filled sac.

Front 3

animal region

Back 3

the end of the fertilized egg where th nuclues is located. dark half in frog

Front 4

archenteron

Back 4

the cavity formed inside the developing embryo when the endoderm and mesoderm invaginate during gastrulation. forms the gut

Front 5

area opaca

Back 5

the dark outer rim of cells that lie outside the translucent area pellucida in chick

Front 6

area pellucida

Back 6

the translucent inner disk of cells that is surrounded by the darker area opaca in chick

Front 7

bipinnaria

Back 7

the free-swimming bilaterally symmetrical larva of a starfish (pluteus)

Front 8

blastocoel

Back 8

the cavity the forms inside of the blastula

Front 9

blastoderm/blastodisc

Back 9

a post-cleavage embryu with a disk-shaped morphology in chick

Front 10

blastomeres

Back 10

the cells dervied fromm cleavage of the early embryo

Front 11

blastopore

Back 11

the opening in the gastruls through which the mesoderm and endoderm invaginate to form the archenteron

Front 12

blastula

Back 12

the early embryonic stae that consists of a hollow ball of cells surrounding the blastocoel cavity.

Front 13

Chorion

Back 13

the outermost of the extraembryonic membranes in birds, reptiles, and mammals, in the chick, the chorion lies just beneath the shell and is involved in gas exchange. in mammals, the chorion forms part of the placenta.

Front 14

cleavage

Back 14

the series of rapid divisions without growth the follows fertilization and divides the zygote into a larger number of equally sized smaller cells

Front 15

ectoderm

Back 15

the germ layer that gives rise to epidermal tissues and the nervous system

Front 16

endoderm

Back 16

the germ layer that gives rise to the lining of the gut and associated organs, such as the liver

Front 17

epiblast

Back 17

the outer cells of the chick blastoderm that give rise to the developing embryo

Front 18

gamete

Back 18

a haploid egg or sperm

Front 19

gastrula

Back 19

the stage of embryotic development the follows the blastual stage. the 3 germ layers are present and the endoderm forms by invaginatioin

Front 20

germ layers

Back 20

the regions of the early embryo that give rise to distinct types of tissue: endoderm, ectoderm, and mesoderm

Front 21

Hensen's node

Back 21

a group of cells at the anterior end of the primative streak that gives rise to the notochord

Front 22

macromeres

Back 22

the large vegetal calls that form from unequal cleavage in the early urchin embryo

Front 23

mesoderm

Back 23

the germ layer that gives rise to the skeleton, musculature, connective tissues, and some internal organs such as the heart

Front 24

micromeres

Back 24

the small veetal cells that form from the unequal cleavage in the early urchin embryo

Front 25

morula

Back 25

a very early stage of embryonic development during which the embryo consists of a solid ball of cells

Front 26

neurulation

Back 26

the process in which the ectoderm the forms the neural plate folds to form the neural tube

Front 27

notochord

Back 27

a flexible rodlike structure in chordates the serves as a skeleton for the developing embryo. indues formation of the neural tube

Front 28

primitive streak

Back 28

the strip of cells in the eaerly chick embryo through which the mesodermal and endodernal cells invaginate during gastrulation

Front 29

somites

Back 29

in chordates, segmented blocks of mesoderm that are found on either side of the notochord

Front 30

vegetal region

Back 30

the region of the fertilized egg that lies opposite the animal region. typically contains most of the yolk and gives rise to mesoderm and endoderm

Front 31

endoderm

Back 31

the germ layer that gives rise to the lining of the gut and associated organs, such as the liver

Front 32

epiblast

Back 32

the outer cells of the chick blastoderm that give rise to the developing embryo

Front 33

gamete

Back 33

a haploid egg or sperm

Front 34

gastrula

Back 34

the stage of embryotic development the follows the blastual stage. the 3 germ layers are present and the endoderm forms by invaginatioin

Front 35

germ layers

Back 35

the regions of the early embryo that give rise to distinct types of tissue: endoderm, ectoderm, and mesoderm

Front 36

Hensen's node

Back 36

a group of cells at the anterior end of the primative streak that gives rise to the notochord

Front 37

macromeres

Back 37

the large vegetal calls that form from unequal cleavage in the early urchin embryo

Front 38

mesoderm

Back 38

the germ layer that gives rise to the skeleton, musculature, connective tissues, and some internal organs such as the heart

Front 39

micromeres

Back 39

the small veetal cells that form from the unequal cleavage in the early urchin embryo

Front 40

morula

Back 40

a very early stage of embryonic development during which the embryo consists of a solid ball of cells

Front 41

neurulation

Back 41

the process in which the ectoderm the forms the neural plate folds to form the neural tube

Front 42

notochord

Back 42

a flexible rodlike structure in chordates the serves as a skeleton for the developing embryo. indues formation of the neural tube

Front 43

primitive streak

Back 43

the strip of cells in the eaerly chick embryo through which the mesodermal and endodernal cells invaginate during gastrulation

Front 44

somites

Back 44

in chordates, segmented blocks of mesoderm that are found on either side of the notochord

Front 45

vegetal region

Back 45

the region of the fertilized egg that lies opposite the animal region. typically contains most of the yolk and gives rise to mesoderm and endoderm

Front 46

vitelline membrane

Back 46

an extracellular membrane that surround the egg. gives rise to the fertilization membrane in the slow block reation that follows fertilization

Front 47

yolk sac

Back 47

an extraembryonic membrane that surrounds the yolk in the amniotic egg