. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. UTERUS — (DEVELOPMENT). 657 am satisfied that no such union takes place; but that, when the deciduu reflexa has ful- filled the offices already assigned to it, and has ceased to be vascular, so that no further addition of material to it can take place, it becomes, after the fifth or sixth month, so completely attenuated by distension from the growth of the ovum within, that it is reduced to a mere film, of which the only trace left at, or indeed before, birth, is a narrow frill still discoverable at the margin of the pla
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. UTERUS — (DEVELOPMENT). 657 am satisfied that no such union takes place; but that, when the deciduu reflexa has ful- filled the offices already assigned to it, and has ceased to be vascular, so that no further addition of material to it can take place, it becomes, after the fifth or sixth month, so completely attenuated by distension from the growth of the ovum within, that it is reduced to a mere film, of which the only trace left at, or indeed before, birth, is a narrow frill still discoverable at the margin of the placenta between the decidua vera and the chorion. But the decidua lining the uterine walls con- tinues vascular to the last; and this alone constitutes the membrane a part of which at birth is found adherent to the outer surface of the chorion, and which Dr. Hunter, from ob- serving that it now consisted of only one layer, imagined was formed of the two de- ciduae united together. Histology of the decidua. — The morpholo- gical changes effected during pregnancy in the Fig. Ilistohqi/ of the decidua. (After Schrceder van der Kolk.) " A, orifice of utricular gland of an unimpregnated adult uterus surrounded by round epithelial cells; B, cells of decidua in an ovum of about three weeks ; a, round and oval nucleated cells; b, fat granula- tions; c, cells, from a deeper layer, elongated and beginning lo lonn fibres; c, the same from an ovum of live weeks; a, round and oval cells, much en- larged, and containing nuclei and fat granulations from the surface; b, elongated cells from a deeper layer; D, orifice of a utricular gland from the same ovum, much enlarged as compared with A; E, margin of a valvular opening in a deeper layer of the decidua, from an ovum of two months; at b, the cells have become elongated, at a they are filled with fat granulations; F, long and broad cells from a decidua of nine months; a, the cells exhibit a nucleus, some having one and others two
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