File:Bailey036.jpg

Fig. 36. Postero-lateral views of successive stages following gastrulation in the frog

Ziegler, from Kellicott.

A, blastopore in process of closing, neural folds slightly indicated;

B, gastrula slightly elongated, blastopore closed, neural groove and folds obvious;

C, anal portion of blastopore still visible at bottom of proctodaeum, neural folds closing dorsally;

D, neural folds nearly closed, branchial arches appearing, tail bud forming; E, neural folds fused, tail bud more conspicuous.

b, Blastopore containing yolk plug; bi, dorsal part of blastopore (rudiment of neurenteric canal) ; fe, ventral part of 'blastopore (rudiment of anus); ba, branchial arches; g, neural gro ve ; nf, neural folds; np, neural plate; p, proctodaeum, with anal portion of the blastopore at the bottom; s, oral sucker; t, tail bud; x, neural folds covering the blastopore thus establishing the neurenteric canal.

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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 18) Embryology Bailey036.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Bailey036.jpg

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