The development of the human body; a manual of human embryology . Fig. 37.—Ovum Measuring 6 >( mm. The Left Half ofthe Chorion has Been Re-moved to show the Embryo. a, Amniotic cavity; 6, belly-stalk;c, chorion; e, embryonic disk; v,chorionic villus; y, yolk-sac.—(von Spec.). Fig. 38. — Embryo mm. inLength, from the DorsalSurface. a, Amnion; m, medullary groove;nc, neurenteric canal; ps, primi-tive streak; y, yolk-sac.—(vonSpec.) size and now forms a pedicle, known as the belly-stalk (b),at the extremity of which is the yolk-sac (y). Further-more, the amniotic cavity (a) now lies so
The development of the human body; a manual of human embryology . Fig. 37.—Ovum Measuring 6 >( mm. The Left Half ofthe Chorion has Been Re-moved to show the Embryo. a, Amniotic cavity; 6, belly-stalk;c, chorion; e, embryonic disk; v,chorionic villus; y, yolk-sac.—(von Spec.). Fig. 38. — Embryo mm. inLength, from the DorsalSurface. a, Amnion; m, medullary groove;nc, neurenteric canal; ps, primi-tive streak; y, yolk-sac.—(vonSpec.) size and now forms a pedicle, known as the belly-stalk (b),at the extremity of which is the yolk-sac (y). Further-more, the amniotic cavity (a) now lies somewhat excen-trically in this pedicle, being near what maybe spoken ofas its anterior surface. The embryo still possesses a dis-coidal form and may still be described as a flat disk float-ing on the surface of the yolk-sac. This same general form is preserved in another embryo,known as embryo Gle, described by Graf Spee, which 86 THE DEVELOPMENT OF THE HUMAN BODY. measured mm. in length (Fig. 38). In it, however,the more median portion of the embryonic disk has be-come thicker and is separated from the more peripheralportions by a distinct furrow. From the more median oraxial portion the embryo proper will develop, and this por-tion is now shaped somewhat like the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
