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26 Cards in this Set

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  • Back
organagenesis
the formation of rudamentary organs and organ systems
notochord
a supportive rod that developes in the mesoderm beneath the neural tube.
somites
blocks of tissue that form along side the nerve chord
primitive streak
a groove on the surface of an avain embryo along the future long axis of the body
chorion
outermost membrane that surrounds the embryo and other extraembrionic membranes
aminion
membrane that surrounds the embryo and the amniotic fluid
yolk sac
membrane located below the developing embryo; does not contain yolk in mammals but is the site of formation of early blood cells
allantois
membrane that forms from an out pocketing of the embrionic gut; developing into the umbilical cord in mammals, acts ad a disposal sac for certain metabolic wastes
adult derivatives of ectoderm
epidermis of skin and its derivatives including sweat, glands, hair follicles
epithelial lining of mouth and rectum
sensory receptors in epidermis, cornea and lens of eye, nervous system, adrenal medulla, tooth enamel, epithelium of pineal and pituitary glands
adult derivatives of mesoderm
notochord, skeletal system, muscular system, muscular layer of the stomach , intestine, ect, ececretory system, circulatory and lymphatic system, reproductive system (except of germ layers), dermis of skin, lining of the body cavity, adrenal cortex
adult derivatives of the endoderm
epithelial lining of digestive tract, epithelial lining of respiratory system, lining of the urethra, urinary bladder, and the reproductive system, liver, pancreas, thymus, thyroid and parathyroid glands
trophoblast
the outer epithelium of the blastocyst
blastocyst
mammilain version of a blastula
invagination
an inward pointing pocket in a cellular ball due to morphegenesis
evagination
an outward pointing pocket in a cellular ball due to morphogenesis
totipotency
the ability of an embrionic cell to form all parts of an animal
cellular differentation
structural and functional divergence of cells as that become soecialized during a multi-cellular organisms developement
cytoplasmic determinants
substances in the cytoplasm ofa cell that influence which genes are expressed by the cell
induction
the ability of one group of cells to influence the gene expression and hence the developement of other cells
pattern formation
developement of a spatal organization in an organism, the ordering of the cells into specific 3 dimensional structures
positional information
signals to which genes regulating developement respond that tel a cell where it is in relation to the body axis and to neighboring cells
sonic hedgehog
cells developement distinguiching between anterior and posterior
placenta in mammals
used for gas exchange and nutrient exchange
morphogenesis
development of a body shape and organization during ontegeny
cellular shape, movement and adhesion
when cells move during developement they produce an extionsion called a lamellopodia( flat) or a filipodia(spike) the movement is made poss by ECM that provides anchor sites so that the cell can move.
ECM in cell shape and movement
extra cellular matrix can provide a track on which the cell can move or a prohibitor that will not allow the cell to move in that direction.