File:Bailey043.jpg

Fig. 43. Diagrammatic reconstructions showing surface views of blastoderms of the pigeon

Patterson, from Lillie. A , from same blastoderm as shown in Fig. 41

the line CD indicating the plane of section of Fig. 41; the numbers 1-7 indicate the thickness of the blastoderm in numbers of cells; the broken line around 1 includes the sector which is one cell thick, at the posterior margin of which invagination begins; GW, germ wall. B, from same blastoderm as shown in Fig. 42;

the arrows at the posterior margin indicate the advance and approach of the two halves of the margin; E, indicates extent of entoderm; O, extension of disk margin beyond germ wall; PA, outer margin of area pellucida; R, margin where invagination is progressing (lip of blastopore) ; Y and Z together indicate region of germ wall. C, from a blastoderm of pigeon 38 hours after fertilization; E indicates extent of entoderm; R, mass of cells where blastopore closed; SG, portion of blastoccel not yet crossed by migrating entodermal cells; other abbreviations as in B.

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Reference

Bailey FR. and Miller AM. Text-Book of Embryology (1921) New York: William Wood and Co.

Cite this page: Hill, M.A. (2024, April 27) Embryology Bailey043.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey043.jpg

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