| OCR Text |
Show 162 Ewest describes formation the of surface of dence of the the the visible primitive pit This eggo gastrulationo to first is A also and, according thaR terminallyo Ewest found than anteriorly" Ewest found many cells" pit make formedo visible examinedo and stomodaeal observations ments" tion epithelium "primary in inner mesentodermal the this primitive manner describes the between the Tiegs the of the and germ bando yolk membrane yolk of the and He also ends compares on of his Calandra "endoderm rudi the noted also the forma endoderm primary or delamina from the and was anterior He Murray (1938) origin to living egg layer proliferated and formed deeper posteriorly by proliferation was of with those presumptive epineural I tyo Concurremt with from all undergoes the be evi deeper medially originates by invaginatione nomcellular a much proctodaeal invaginations directly from of to the that entoderm and Jacksotl oryzaeo is behaved formed are middle the that believed states first gastral furrow is blastoderm before cells Enough ends the it the Ifstream of movementr! when the Bijjani tioR while c av a posterior the from the separating was (1939), as posterio-ventral considered distinct Jackson differentiation the on same edges of dorsal time the the gastrulation germ bando flexure and the The becomes anterior end of tbe folds amniotic tail buried of the in the germ band arise embryo yolko moves At toward |
