Germinal stage human Black & White Stock Photos
. A laboratory manual and text-book of embryology. Embryology. 42 SEGMENTATION OF THE FERTILIZED OVUM ing from the dorsal surface of the germinal area into the space beneath the ento- derm, the archenteron. No gastrulation stage for the human embryo has yet been observed but the primitive streak may be recognized in later stages (Fig. 73 A). There is also evidence of an opening, the notochordal or neurenteric canal, leading from the exterior into the cavity of the primitive gut (archenteron). According to the view of Keibel and Hubrecht, the invagination of cells to form the noto- chordal plat Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-laboratory-manual-and-text-book-of-embryology-embryology-42-segmentation-of-the-fertilized-ovum-ing-from-the-dorsal-surface-of-the-germinal-area-into-the-space-beneath-the-ento-derm-the-archenteron-no-gastrulation-stage-for-the-human-embryo-has-yet-been-observed-but-the-primitive-streak-may-be-recognized-in-later-stages-fig-73-a-there-is-also-evidence-of-an-opening-the-notochordal-or-neurenteric-canal-leading-from-the-exterior-into-the-cavity-of-the-primitive-gut-archenteron-according-to-the-view-of-keibel-and-hubrecht-the-invagination-of-cells-to-form-the-noto-chordal-plat-image232351014.htmlRMRE0E2E–. A laboratory manual and text-book of embryology. Embryology. 42 SEGMENTATION OF THE FERTILIZED OVUM ing from the dorsal surface of the germinal area into the space beneath the ento- derm, the archenteron. No gastrulation stage for the human embryo has yet been observed but the primitive streak may be recognized in later stages (Fig. 73 A). There is also evidence of an opening, the notochordal or neurenteric canal, leading from the exterior into the cavity of the primitive gut (archenteron). According to the view of Keibel and Hubrecht, the invagination of cells to form the noto- chordal plat
. Human embryology and morphology. Embryology, Human; Morphology. 88 HUMAN EMBRYOLOGY AND MORPHOLOGY. the morula stage by the collection of fluid within the mass of cells. The cells are then seen to be arranged in two sets—(a) a layer lining the zona radiata and forming the wall of the vesicle Zona radiata germinal cells. Rauber's layer. Fio. 66.—Diagrammatic section of a Blastodermic Vesicle. (Eauber's layer) (Fig. 66), and (6) a group of granular cells within the cavity attached to Eauber's layer at the embryogenic pole of the vesicle (Fig. 66). In Vertebrates with huge stores of yolk in the Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/human-embryology-and-morphology-embryology-human-morphology-88-human-embryology-and-morphology-the-morula-stage-by-the-collection-of-fluid-within-the-mass-of-cells-the-cells-are-then-seen-to-be-arranged-in-two-setsa-a-layer-lining-the-zona-radiata-and-forming-the-wall-of-the-vesicle-zona-radiata-germinal-cells-raubers-layer-fio-66diagrammatic-section-of-a-blastodermic-vesicle-eaubers-layer-fig-66-and-6-a-group-of-granular-cells-within-the-cavity-attached-to-eaubers-layer-at-the-embryogenic-pole-of-the-vesicle-fig-66-in-vertebrates-with-huge-stores-of-yolk-in-the-image232346012.htmlRMRE07KT–. Human embryology and morphology. Embryology, Human; Morphology. 88 HUMAN EMBRYOLOGY AND MORPHOLOGY. the morula stage by the collection of fluid within the mass of cells. The cells are then seen to be arranged in two sets—(a) a layer lining the zona radiata and forming the wall of the vesicle Zona radiata germinal cells. Rauber's layer. Fio. 66.—Diagrammatic section of a Blastodermic Vesicle. (Eauber's layer) (Fig. 66), and (6) a group of granular cells within the cavity attached to Eauber's layer at the embryogenic pole of the vesicle (Fig. 66). In Vertebrates with huge stores of yolk in the
. A laboratory manual and text-book of embryology. Embryology. 40 SEGMENTATION OF THE FERTILIZED OVUM. Fig. 21.—Two germ-discs of hen's egg in the first hours of incubation (after Koller in Heisler): df, area opaca; hf, area pellucida; s, crescent; sk, crescent-knob; es, embryonic shield; pr, primitive groove. formed is not known. It is attached only to the cells of the germinal area. Although this stage has not been observed in the human embryo it is probable from the structure of the youngest known human embryo that an entodermal vesicle is formed in much the same way as in Tarsius. Gastrula Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-laboratory-manual-and-text-book-of-embryology-embryology-40-segmentation-of-the-fertilized-ovum-fig-21two-germ-discs-of-hens-egg-in-the-first-hours-of-incubation-after-koller-in-heisler-df-area-opaca-hf-area-pellucida-s-crescent-sk-crescent-knob-es-embryonic-shield-pr-primitive-groove-formed-is-not-known-it-is-attached-only-to-the-cells-of-the-germinal-area-although-this-stage-has-not-been-observed-in-the-human-embryo-it-is-probable-from-the-structure-of-the-youngest-known-human-embryo-that-an-entodermal-vesicle-is-formed-in-much-the-same-way-as-in-tarsius-gastrula-image232351044.htmlRMRE0E3G–. A laboratory manual and text-book of embryology. Embryology. 40 SEGMENTATION OF THE FERTILIZED OVUM. Fig. 21.—Two germ-discs of hen's egg in the first hours of incubation (after Koller in Heisler): df, area opaca; hf, area pellucida; s, crescent; sk, crescent-knob; es, embryonic shield; pr, primitive groove. formed is not known. It is attached only to the cells of the germinal area. Although this stage has not been observed in the human embryo it is probable from the structure of the youngest known human embryo that an entodermal vesicle is formed in much the same way as in Tarsius. Gastrula
