. The elements of embryology. Embryology; Embryology. 45 Diagrammatic longitudinal section through the pos- terior END OF an Embryo Bird, at the time of the formation of the Allantois. ep. epiblast; spinal canal; ch. notocliord; neurenteric canal; hy. hypoblast; postanal gut; pr. remains of primitive streak folded in on the ventral side ; al. allantois ; me. mesoblast; an. point where anus will be formed; perivisceral cavity; am. amnion; so. somatopleure ; sp. splanchnopleure. Each fold, of course, necessarily consists of two limbs, both limbs consisting of epiblast and
. The elements of embryology. Embryology; Embryology. 45 Diagrammatic longitudinal section through the pos- terior END OF an Embryo Bird, at the time of the formation of the Allantois. ep. epiblast; spinal canal; ch. notocliord; neurenteric canal; hy. hypoblast; postanal gut; pr. remains of primitive streak folded in on the ventral side ; al. allantois ; me. mesoblast; an. point where anus will be formed; perivisceral cavity; am. amnion; so. somatopleure ; sp. splanchnopleure. Each fold, of course, necessarily consists of two limbs, both limbs consisting of epiblast and a \^ery thin layer of mesoblast; but in one limb the epiblast looks towards the embryo, while in the other it looks away from it. The space between the two limbs of the fold, as can easily be seen in Figs. 9 and 11, is really part of the space between the somatopleure and splanch- nopleure ; it is therefore continuous with the general space, part of which afterwards becomes the pleuro- peritoneal cavity of the body, shaded with dots in figure 9 and marked (p p). It is thus possible to pass from the cavity between the two limbs of each. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Foster, M. (Michael), Sir, 1836-1907; Balfour, Francis M. (Francis Maitland), 1851-1882; Sedgwick, Adam, 1854-1913; Heape, Walter, 1855-1929. London : Macmillan and Co.
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Keywords: ., bookcentury1800, bookdecade1, booksubjectembryology, bookyear1883
