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Fig. 31. Median sagittal sections showing successive stages of gastrulation in the frog's egg
Bracket, from Kellicott.
A, beginning of gastrulation
B, slight advance in invagination and beginning of epiboly
C, invagination and epiboly progressing, inflection of cells (involution) occurring around dorsal lip of blastopore which is now an obvious structure
D, epiboly has resulted in covering of a large part of yolk by lip of blastopore
E, blastopore is now circular and filled with the yolk plug (cf. Fig. 30, A, 4) and the archenteron appears as a small space
F, the blastoccel is nearly obliterated
G, gastrulation completed.
a, Archenteron; b, blastopore; c, rudiment of notocord; ec, ectoderm; en, entoderm; gc, gastrular cleavage, ge, entoderm (protentoderm) ; m, peristomal mesoderm; np, neural plate; w/, transverse neural ridge; s, blastocoel.
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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, May 15) Embryology Bailey031.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey031.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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