The Journal of experimental zoology . the 4-cell stage, fixed 22 hours later. In the posterior quarterthe muscle and mesenchyme cells form a solid mass; in the anterior quarter the chorda cells projectfreely over the dorsal surface and the neural plate is partially infolded and contains three sense spots. Fig. 67. Right anterior and left posterior (diagonal) quarter embryos, dorsal view; spurted in4-cell stage, fixed 22 hours later. Fig. 68. Left anterior and right posterior (diagonal) quarter embryos, dorsal view; spurted in4-cell stage, fixed 22 hours later. In this and the preceding figure
The Journal of experimental zoology . the 4-cell stage, fixed 22 hours later. In the posterior quarterthe muscle and mesenchyme cells form a solid mass; in the anterior quarter the chorda cells projectfreely over the dorsal surface and the neural plate is partially infolded and contains three sense spots. Fig. 67. Right anterior and left posterior (diagonal) quarter embryos, dorsal view; spurted in4-cell stage, fixed 22 hours later. Fig. 68. Left anterior and right posterior (diagonal) quarter embryos, dorsal view; spurted in4-cell stage, fixed 22 hours later. In this and the preceding figure the chorda cells (Ch.), neural plate(n. p.) and sense spots are found only in the anterior quarters; the muscle, mesenchyme and caudalendoderm cells, only in the posterior quarters. Figs. 69, 70. Right anterior quarter embryos, dorsal side above; spurted in 4-cell stage, fixed 12hours later. These embryos show free chorda cells, neural plate and sense spots, but not a trace ofmuscle cells. Mosaic Development in Ascidian Eggs.
Size: 2488px × 1004px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology
