. Animal growth and development. Embryology; Growth; Biology; Growth; Embryology; Animals -- growth & development. Cell interactions during Growth and Morphogenesis 85 Synergistic Inductions Synergistic inductions are those in which two different tissues mu- tually interact so that each causes the other to develop in a way that it would not do when alone. For example, the developing kidney contains many small S-shaped secretory tubules connected to a fan-like network of branched collecting tubes which serve to transport material collected by the secretory tubules into the ureter to be void
. Animal growth and development. Embryology; Growth; Biology; Growth; Embryology; Animals -- growth & development. Cell interactions during Growth and Morphogenesis 85 Synergistic Inductions Synergistic inductions are those in which two different tissues mu- tually interact so that each causes the other to develop in a way that it would not do when alone. For example, the developing kidney contains many small S-shaped secretory tubules connected to a fan-like network of branched collecting tubes which serve to transport material collected by the secretory tubules into the ureter to be voided as urine. Figure 41 is a schematic diagram of kidney-tubule development. The tubes and tubules originate from two different rudimentary tissues, starting at about the eleventh day of embryonic life; these are the nephrogenic cord, a loose collection of mesodermal cells, and the ureteric bud, a compact tubular tissue also derived from mesoderm. The development of the secre- tory tubules from the former and the collecting tubes from the latter has been found to depend on the intimate association of both. Removal of either from the embryo stops the development of the other. It is possible to separate the ureteric bud and the associated nephro- genic cord from a mouse embryo and cultivate the tissues on a blood clot overlain with a nutrient solution. Under these conditions, tubes and tubules develop as they do in the embryo. If the two tissues are separated from each other and cultivated, tubes and tubules never develop. Many unsuccessful attempts have been made to extract material from either tissue, that, when added to a culture of the other, would make it develop in normal fashion. If, however, the two tissues are separated by a very thin membrane with tiny holes, the synergistic induction does occur. Al- though the membrane is thick enough to prevent the two kinds of cells from touching each other across the membrane, blobs of cytoplasm could conceivably pass between the two
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