. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. E FIGURE 5. Twenty-two cell stage stage. A. Animal pole; ch. n.—chorda-neural crescent; mes.—mesodermal crescent; cct.—ecto- dermal micromeres, B. Posterior view, C. Left side, D. Anterior view, E. Right side. first cells of the mesodermal crescent to be inturned at the lateral lips of the blas- topore are mesenchyme cells which come to lie ventrally in the trunk region of the embryo. The cells that converge medially to form the lateral lips after the mesenchyme invaginates are presumptive muscle cells of the tail. The final
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. E FIGURE 5. Twenty-two cell stage stage. A. Animal pole; ch. n.—chorda-neural crescent; mes.—mesodermal crescent; cct.—ecto- dermal micromeres, B. Posterior view, C. Left side, D. Anterior view, E. Right side. first cells of the mesodermal crescent to be inturned at the lateral lips of the blas- topore are mesenchyme cells which come to lie ventrally in the trunk region of the embryo. The cells that converge medially to form the lateral lips after the mesenchyme invaginates are presumptive muscle cells of the tail. The final blasto- pore is T shaped, neural cells forming the anterior lip, muscle cells forming the lateral margins of the posterior lip. The posterior lip forms the limb of the T where the lateral lips converge toward the mid-plane in a groove. At the posterior- most point in the groove the caudal mesenchyme cells are lodged. Chordal and endodermal cells invaginate, the latter forming a typical archenteron. The blasto-. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
