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47 Cards in this Set

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Allantois
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.
amnion
the extraembryonic membrans that surrounds the developing embryo in a fluid-filled sac.
animal region
the end of the fertilized egg where th nuclues is located. dark half in frog
archenteron
the cavity formed inside the developing embryo when the endoderm and mesoderm invaginate during gastrulation. forms the gut
area opaca
the dark outer rim of cells that lie outside the translucent area pellucida in chick
area pellucida
the translucent inner disk of cells that is surrounded by the darker area opaca in chick
bipinnaria
the free-swimming bilaterally symmetrical larva of a starfish (pluteus)
blastocoel
the cavity the forms inside of the blastula
blastoderm/blastodisc
a post-cleavage embryu with a disk-shaped morphology in chick
blastomeres
the cells dervied fromm cleavage of the early embryo
blastopore
the opening in the gastruls through which the mesoderm and endoderm invaginate to form the archenteron
blastula
the early embryonic stae that consists of a hollow ball of cells surrounding the blastocoel cavity.
Chorion
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.
cleavage
the series of rapid divisions without growth the follows fertilization and divides the zygote into a larger number of equally sized smaller cells
ectoderm
the germ layer that gives rise to epidermal tissues and the nervous system
endoderm
the germ layer that gives rise to the lining of the gut and associated organs, such as the liver
epiblast
the outer cells of the chick blastoderm that give rise to the developing embryo
gamete
a haploid egg or sperm
gastrula
the stage of embryotic development the follows the blastual stage. the 3 germ layers are present and the endoderm forms by invaginatioin
germ layers
the regions of the early embryo that give rise to distinct types of tissue: endoderm, ectoderm, and mesoderm
Hensen's node
a group of cells at the anterior end of the primative streak that gives rise to the notochord
macromeres
the large vegetal calls that form from unequal cleavage in the early urchin embryo
mesoderm
the germ layer that gives rise to the skeleton, musculature, connective tissues, and some internal organs such as the heart
micromeres
the small veetal cells that form from the unequal cleavage in the early urchin embryo
morula
a very early stage of embryonic development during which the embryo consists of a solid ball of cells
neurulation
the process in which the ectoderm the forms the neural plate folds to form the neural tube
notochord
a flexible rodlike structure in chordates the serves as a skeleton for the developing embryo. indues formation of the neural tube
primitive streak
the strip of cells in the eaerly chick embryo through which the mesodermal and endodernal cells invaginate during gastrulation
somites
in chordates, segmented blocks of mesoderm that are found on either side of the notochord
vegetal region
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
endoderm
the germ layer that gives rise to the lining of the gut and associated organs, such as the liver
epiblast
the outer cells of the chick blastoderm that give rise to the developing embryo
gamete
a haploid egg or sperm
gastrula
the stage of embryotic development the follows the blastual stage. the 3 germ layers are present and the endoderm forms by invaginatioin
germ layers
the regions of the early embryo that give rise to distinct types of tissue: endoderm, ectoderm, and mesoderm
Hensen's node
a group of cells at the anterior end of the primative streak that gives rise to the notochord
macromeres
the large vegetal calls that form from unequal cleavage in the early urchin embryo
mesoderm
the germ layer that gives rise to the skeleton, musculature, connective tissues, and some internal organs such as the heart
micromeres
the small veetal cells that form from the unequal cleavage in the early urchin embryo
morula
a very early stage of embryonic development during which the embryo consists of a solid ball of cells
neurulation
the process in which the ectoderm the forms the neural plate folds to form the neural tube
notochord
a flexible rodlike structure in chordates the serves as a skeleton for the developing embryo. indues formation of the neural tube
primitive streak
the strip of cells in the eaerly chick embryo through which the mesodermal and endodernal cells invaginate during gastrulation
somites
in chordates, segmented blocks of mesoderm that are found on either side of the notochord
vegetal region
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
vitelline membrane
an extracellular membrane that surround the egg. gives rise to the fertilization membrane in the slow block reation that follows fertilization
yolk sac
an extraembryonic membrane that surrounds the yolk in the amniotic egg