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26 Cards in this Set
- Front
- Back
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organagenesis
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the formation of rudamentary organs and organ systems
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notochord
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a supportive rod that developes in the mesoderm beneath the neural tube.
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somites
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blocks of tissue that form along side the nerve chord
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primitive streak
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a groove on the surface of an avain embryo along the future long axis of the body
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chorion
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outermost membrane that surrounds the embryo and other extraembrionic membranes
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aminion
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membrane that surrounds the embryo and the amniotic fluid
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yolk sac
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membrane located below the developing embryo; does not contain yolk in mammals but is the site of formation of early blood cells
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allantois
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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
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adult derivatives of ectoderm
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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 |
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adult derivatives of mesoderm
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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
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adult derivatives of the endoderm
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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
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trophoblast
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the outer epithelium of the blastocyst
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blastocyst
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mammilain version of a blastula
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invagination
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an inward pointing pocket in a cellular ball due to morphegenesis
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evagination
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an outward pointing pocket in a cellular ball due to morphogenesis
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totipotency
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the ability of an embrionic cell to form all parts of an animal
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cellular differentation
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structural and functional divergence of cells as that become soecialized during a multi-cellular organisms developement
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cytoplasmic determinants
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substances in the cytoplasm ofa cell that influence which genes are expressed by the cell
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induction
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the ability of one group of cells to influence the gene expression and hence the developement of other cells
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pattern formation
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developement of a spatal organization in an organism, the ordering of the cells into specific 3 dimensional structures
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positional information
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signals to which genes regulating developement respond that tel a cell where it is in relation to the body axis and to neighboring cells
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sonic hedgehog
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cells developement distinguiching between anterior and posterior
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placenta in mammals
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used for gas exchange and nutrient exchange
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morphogenesis
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development of a body shape and organization during ontegeny
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cellular shape, movement and adhesion
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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.
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ECM in cell shape and movement
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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.
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