. Quain's elements of anatomy . e pericardium were distinctly recognisable, as well as several otherpoints of structme belonging to the embryo, which will be referred toat a later period. The cephalic portion of the intestine was formed andenclosed, but the larger hinder part was no more than a groove openingwidely into the yolk-sac (fig. 667). The vitelline vessels were distincton this last. The chorion was imiformly covered with villi, whichwere hollow ; and the vascular layer of the allantois ran inside it with-out however yet penetrating the villi. An embryo described by His, marked L in h
. Quain's elements of anatomy . e pericardium were distinctly recognisable, as well as several otherpoints of structme belonging to the embryo, which will be referred toat a later period. The cephalic portion of the intestine was formed andenclosed, but the larger hinder part was no more than a groove openingwidely into the yolk-sac (fig. 667). The vitelline vessels were distincton this last. The chorion was imiformly covered with villi, whichwere hollow ; and the vascular layer of the allantois ran inside it with-out however yet penetrating the villi. An embryo described by His, marked L in his Monograph, presentssome of the same features. (Fig. 666, A.) In human ova which may be estimated as approaching the term ofthree weeks after conception, the body of the embryo is found to becurved, the cejjhalic flexure has also taken place, several of the pharyngealbars and clefts appear below the cranium, and the communication intestine and yolk-sac is much reduced in size, though still wide. Fig. 668. Fig
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
