. The physiology of reproduction. Reproduction. FOETAL NUTRITION: THE PLACP^NTA 473 dilated, and blood extravasations occur between ths cells and into the lumen. The tissue is oedematous and spongy, and the swollen cells often appear to be floating free in a fluid (v. Heukelom). These changes are especially marked near the ovum, and they give rise to an elevation which marks the resting-place of an early blastocyst. The mucosa is differentiated into a superficial layer, the convpacta, and a deeper layer, the sfongiosa, in which are the enlarged middle portions of the glands, arterioles, venule
. The physiology of reproduction. Reproduction. FOETAL NUTRITION: THE PLACP^NTA 473 dilated, and blood extravasations occur between ths cells and into the lumen. The tissue is oedematous and spongy, and the swollen cells often appear to be floating free in a fluid (v. Heukelom). These changes are especially marked near the ovum, and they give rise to an elevation which marks the resting-place of an early blastocyst. The mucosa is differentiated into a superficial layer, the convpacta, and a deeper layer, the sfongiosa, in which are the enlarged middle portions of the glands, arterioles, venules, and lymphatics. In the compacta the connective tissue cells undergo active division, and they enlarge to form the decidual cells (Fig. 126). Before the excavation of the " Eikammer " they are probably not found, though Peters described the com- mencement of a decidual change before that stage. In Merttens' ^ ovum large decidual cells were found, many of them fusiform and lying parallel to the surface. The decidual change arises first in the connective tissue cells near the ovum, and later it ex- tends more deeply in the compacta. There is no special. 7?«/. Fig. 126.—Condition of the glands at the beginning of pregnancy in Man (after Kundrat and Engel- mann). (From Quain's Anatomy, Longmans.) c, compact layer near free surface of decidua: the glands are here some- what enlarged, but not very tor- tuous, and the mucous membrane is rendered compact by the hyper- trophy of the interglandular tissue; sp., spongy layer containing the middle portion of theglandsgreatly enlarged and tortuous, producing it spongy condition in the mucous membrane ; d, deepest portion of glands, elongated not much enlarged; m., muscularis. perivascular development as ' Merttens, " Beitrage zur normalen und pathologischen Anatomie der menschlichen Placenta," Zeitschr. f. Gynak., vols, , Please note that these images are extracted fr
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