Volume 1

A treatise on the science and practice of midwifery / by W.S. Playfair.

  • William Smoult Playfair
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on the science and practice of midwifery / by W.S. Playfair. Source: Wellcome Collection.

    135/488 (page 103)
    Chap. I.] CONCEPTION AND GENERATION. into the inter-villous spaces, thus bringing the foetal tissues into direct contact with the maternal blood. A simple form of placentation is thus established, which by the end of the second week involves the whole superficies of the ovum, thus corresponding to the diflTused placenta of the sow, the mare, the cetacea, &c. In Leopold's first case Fig. 57. SECTION THROUGH OVUM AND UTERINE WALL ; END OF PIHST 'WEEK. (After Leopold.) D.v. Decidua vera. Comp. Compact layer. Amp. Ampullary layer. M. Muscular wall of uterus. D.c. Decidua capsularis (refiesa). h.h. Wall of ovuua (chorion). a.. Structureless remains of embryonic area. c.c. Chorionic villi, d. Serotinal process to whicli ovum is attached, e. Maternal vessel opening into chorio- decidual space. /. Chorionic villi imbedded in decidua. traces of vascularisation were found in some, but not all of the villi, and it is probable, therefore, that the foetal circulation is at this stage incomplete, and transference of nutriment by osmosis from the maternal to the foetal blood currents cannot occur; but doubtless the villi are able to absorb directly from the maternal blood without the aid of an active circulation. In the mammalia generally the