The development of the human body; a manual of human embryology . Fig. 41.—Reconstruction of Embryo mm. , Allantois; am, amnion; B, belly-stalk; ch, chorion; h, heart; ms,mesodermic somite; os, oral fossa; ph, pharynx; v, chorionicvilli; Y, yolk-sac.—(After Etemod.) evidently older than the preceding one, and describedby Eternod, the edges of the medullary folds have not onlycome into contact throughout the greater portion of theirlength, but they have fused together, the groove betweenthem being open only in front and behind. On each sideof the median line eight somewhat oblong ar
The development of the human body; a manual of human embryology . Fig. 41.—Reconstruction of Embryo mm. , Allantois; am, amnion; B, belly-stalk; ch, chorion; h, heart; ms,mesodermic somite; os, oral fossa; ph, pharynx; v, chorionicvilli; Y, yolk-sac.—(After Etemod.) evidently older than the preceding one, and describedby Eternod, the edges of the medullary folds have not onlycome into contact throughout the greater portion of theirlength, but they have fused together, the groove betweenthem being open only in front and behind. On each sideof the median line eight somewhat oblong areas are to be THE EXTERNAL FORM OF THE BODY. 89 distinguished, caused by a transverse division of the sub-jacent mesoderm into what are termed mesodermic somites am. Fig. 42.—Embryo mm. , Amnion; B, belly-stalk; //, heart; M, closed, and M, still openportions of the medullary groove; Om, omphalo-mesenteric vein;OS, oral fossa; Y, yolk-sac.—(Kallmann.) (ms), structures which will be described in detail in thesucceeding chapter. The separation of the embryo from go THE DEVELOPMENT OF THE HUMAN BODY. the yolk-sac (Y) has advanced considerably and the sacshows evident indications of constriction just where itmeets the body of the embryo. The head projects moremarkedly beyond the anterior surface of the yolk-sac andis separated from the region occupied by the heart (h) am
Size: 1125px × 2222px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
