The development of the human body; a manual of human embryology . v*®^. Fig. 28.—Suctions of Ova of a Bat showing (A) the Formation ofthe Endoderm and (B and C) of the Amniotic Cavity.—{VanBeneden.) the ovum is now formed of three layers, an outer onewhich may be termed the trophoblast, a middle one which THE FORMATION OF THE GERM LAYERS. 73 probably is transformed into the extra-embryonic meso-derm of later stages, though its significance is at presentsomewhat obscure, and an inner one which is the primaryendoderm. In the bat, of whose ovum Fig. 28, C, repre-sents a section, that portion of t
The development of the human body; a manual of human embryology . v*®^. Fig. 28.—Suctions of Ova of a Bat showing (A) the Formation ofthe Endoderm and (B and C) of the Amniotic Cavity.—{VanBeneden.) the ovum is now formed of three layers, an outer onewhich may be termed the trophoblast, a middle one which THE FORMATION OF THE GERM LAYERS. 73 probably is transformed into the extra-embryonic meso-derm of later stages, though its significance is at presentsomewhat obscure, and an inner one which is the primaryendoderm. In the bat, of whose ovum Fig. 28, C, repre-sents a section, that portion of the middle layer whichforms the roof of the amniotic cavity disappears, only the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
