. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. CHAPTER VI. THE DECIDU/E AND THE EMBEDDING OF THE OVUM. THE PLACENTA. THE UMBILICAL CORD. THE DECIDLMH AND THE EMBEDDING OF THE OVUM. The deciduae (deciduous or caducous membranes) are the hypertrophied mucosa of the uterus so developed as to form not only a lining for the uterine cavity, but also an envelope enclosing the ovum, and a specially altered part which serves as a bond of connection between the ovum and the womb. During the four or five days preceding menstruation, the so- called cons
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. CHAPTER VI. THE DECIDU/E AND THE EMBEDDING OF THE OVUM. THE PLACENTA. THE UMBILICAL CORD. THE DECIDLMH AND THE EMBEDDING OF THE OVUM. The deciduae (deciduous or caducous membranes) are the hypertrophied mucosa of the uterus so developed as to form not only a lining for the uterine cavity, but also an envelope enclosing the ovum, and a specially altered part which serves as a bond of connection between the ovum and the womb. During the four or five days preceding menstruation, the so- called constructive stage of the menstrual cycle, the mucous mem- brane of the womb becomes much thickened and unusually vascular, the purpose of these changes being evidently the preparation of the uterus for the reception of the ovum in the event of impregna- tion. If impregnation has not occurred, the thickened mucosa, the decidua menstrualis, is in great part cast off as a part of the men- strual discharge; if, on the other hand, conception has taken place, the mucous membrane undergoes still greater hypertrophy. On sec- tion, it is seen to consist of a super- ficial compact stratum and a deeper spongy layer reposing directly upon the muscular wall of the uterus. In the compact layer are the necks of the much 95. JWuSc u /a, ttcre Fig. 51—Cross section through the mucous membrane of the uterus at the beginning of preg- nancy (after Kundrat and En- gelmann).. 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 Heisler, John Clement; Waterstone, David, former owner; Duke-Elder, Stewart, 1898-1978, former owner; University College, London. Library Services. Philadelphia : W. B. Saunders Company
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