A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . .Compare also Got-tes description ofthe neui-enteric ca-nal in was discoveiedby Gasser * in gooseembryos. Braun^has shown that bothcanals may be pres-ent in various birdembryos at a stagewhen there are sixor eight pairs ofmyotomes and thedevelopment of tlietail is just begin-ning, ihe neuren-teric canal lies ashort distance infront of the blasto-poric, which is thelarger of the two canals ap-pear in some spe-cies at the same time, or in other s
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . .Compare also Got-tes description ofthe neui-enteric ca-nal in was discoveiedby Gasser * in gooseembryos. Braun^has shown that bothcanals may be pres-ent in various birdembryos at a stagewhen there are sixor eight pairs ofmyotomes and thedevelopment of tlietail is just begin-ning, ihe neuren-teric canal lies ashort distance infront of the blasto-poric, which is thelarger of the two canals ap-pear in some spe-cies at the same time, or in other species at slightlydifferent stages. The posterior canal is more oftenobliterated in birds tlitm the anterior. In the duck andin Motacilla flava the canals are separated both in thetimes and positions of their occurrence; in the Australianparoquet they are both present contemporaneously,although the neurenteric passage becomes open earli-est. Fig. 5160 represents a transverse section, whichpasses through the neurenteric canal of the the common fowl the blastoporic canal appears not. Fig. 5159,—Longitudinal Se<tion of a FrocsOvum shortly after the Cli).sure of theMedullary (;roove. The blastoporic canal,hl.^ is only partially cut, but was foundopen In neigliliortiiK sictiniis, (AfterDurham.) Mil. Miilullary canal; : Vit., fnrmin^r the ttoor ofthe entodermic cavity, Eiit.; uc, neu-renteric canal.
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