. The elements of embryology. Embryology; Embryology. 312 THE MAMMALIAN EMBRYO. [chap, that the peripheral nucleus was derived from the sper- matic element. Segmentation. The process of segmentation oc- cupies in the rabbit about 72 hours; but the time of this and all other stages of development varies con- siderably in different animals. The details of segmentation in the rabbit are differ- ently described by various observers; but at the close of segmentation the ovum appears undoubtedly to be composed of an outer layer of cubical hyaline cells, almost entirely surrounding an inner mass of h
. The elements of embryology. Embryology; Embryology. 312 THE MAMMALIAN EMBRYO. [chap, that the peripheral nucleus was derived from the sper- matic element. Segmentation. The process of segmentation oc- cupies in the rabbit about 72 hours; but the time of this and all other stages of development varies con- siderably in different animals. The details of segmentation in the rabbit are differ- ently described by various observers; but at the close of segmentation the ovum appears undoubtedly to be composed of an outer layer of cubical hyaline cells, almost entirely surrounding an inner mass of highly granular rounded or polygonal cells. Fig. Optical Sections of a Rabbit's Ovum at two Stages CLOSELY following UPON THE SEGMENTATION. (After E. van Beneden.) ep. outer layer; hy. inner mass ; hjp. Van Beneden's blastopore. The shading of the outer and inner layers is diagrammatic. In a small circular area however the inner mass of cells remains exposed at the surface (Fig. 95, A). This. 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
