. The elements of experimental embryology. Embryology, Experimental; Embryology. be /I on I nl â ,.,-1 ami. A B Fig. 99 Mosaic development and self-differentiation of the chick eye-rudiment cultivated in vitro. The eye-cup and lens were removed from an embryo incubated for 66 hours and cultured for 8 days in plasma with embryo extract. Histological differentiation has proceeded at almost the normal rate, in spite of the fact that the morphological differentiation of the structures is highly abnormal and that they are subnormal in size. Histological differentiation is therefore independent
. The elements of experimental embryology. Embryology, Experimental; Embryology. be /I on I nl â ,.,-1 ami. A B Fig. 99 Mosaic development and self-differentiation of the chick eye-rudiment cultivated in vitro. The eye-cup and lens were removed from an embryo incubated for 66 hours and cultured for 8 days in plasma with embryo extract. Histological differentiation has proceeded at almost the normal rate, in spite of the fact that the morphological differentiation of the structures is highly abnormal and that they are subnormal in size. Histological differentiation is therefore independent of morphological differentiation, and of the normal rate of cell multiplication. A, Sectionof the whole explant. B,Section through the retina of a 17-day explant, in which all the layers are normally developed, amacrine cells; bipolar cells; ect. ectoderm; external limiting membrane; ganglion cell; internal limiting membrane; inner molecular layer; inner nuclear layer; /. lens; Muller's fibres; outer molecular layer; outer nuclear layer; pars â¢, pigment layer pars optica retinae. (From Strangeways and Fell, Proc. Roy. Sac. B, c, 1926.) In vitro cultivation of rudiments of presumptive regions has also been practised with chick material. The optic cup (fig. 99), por- ^ Goerttler, 1928. ^ Stohr, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Huxley, Julian, 1887-1975; De Beer, Gavin, Sir, 1899-1972. New York [Hafner Pub. Co. ]
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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectembryology
