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Typus
Verschleierung
Bearbeiter
Graf Isolan
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Untersuchte Arbeit:
Seite: 30, Zeilen: 12-22
Quelle: Borges et al 2003
Seite(n): 442, Zeilen: li.Sp. 5ff
As the development proceeds, a fluid filled sac called amniotic cavity surrounds the embryo and the CAM is formed on the fourth day of incubation by the fusion of the ectodermal epithelium (chorion) and the endodermal epithelium (allantois). At this stage, undifferentiated blood vessels are scattered in the mesoderm of the CAM. These vessels grow rapidly until day 8, when some vessels differentiate into capillaries and form a layer at the base of the ectoderm. At ID 14, 6 days before hatching, the capillary plexus is located at the surface of the ectoderm adjacent to the shell membrane 282. This extraembryonic membrane serves as a transient gas exchange surface similar to the lung. An extensive capillary network provides its respiratory function. The CAM functions for gas exchange (lung), storage of excretory urinary products (reservoir function), and mobilization of calcium from the shell to start bone mineralization (mineral resorption).

282. Romanoff AL (1960) The Avian Embryo. Macmillan, New York

The chick embryo chorioallantoic membrane is an extraembryonic membrane that serves as a transient gas exchange surface similar to the lung. Its respiratory function is provided by an extensive capillary network.13 The CAM is formed on the fourth day of incubation by the fusion of the ectodermal epithelium (chorion) and the endodermal epithelium (allantois). At this stage, undifferentiated blood vessels are scattered in the mesoderm of the CAM. These vessels grow rapidly until day 8, when some vessels differentiate into capillaries and form a layer at the base of the ectoderm. At day 14, 6 days before hatching, the capillary plexus is located at the surface of the ectoderm adjacent to the shell membrane14,15 (Fig. 1). As the only vascularized epithelium, the CAM functions for gas exchange (lung), storage of excretory urinary products (reservoir function), and mobilization of calcium from the shell to start bone mineralization (mineral resorption).

13. Romanoff, A.L. Membrane growth and function. Ann. N.Y. Acad. Sci. 55, 288, 1952.

14. Leeson, T.S., and Leeson, C.R. The chorio-allantois of the chick: Light and electron microscopic observations at various times of incubation. J. Anat. 79, 585, 1964.

15. Rizzo, V., Kim, D., Duran, W.N., and DeFouw, D.O. Differentiation of the microvascular endothelium during early angiogenesis and respiratory onset in the chick chorioallantoic membrane. Tissue Cell 27, 159, 1995.

27. Romanoff, A.L. The Avian Embryo. New York: Macmillan, 1960.

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