. The science and art of midwifery. ary tubes into the substance of the placenta from itsmaternal surface. The fluid consisted of serum, of some of the formed elements of theblood, and of a multitude of spherical bodies which he regarded as analogous to milk glob-ules. Werth, however, Ueber die sogenannte Uterinmilch des Menschen, Arch, , Bd. xxii, p. 233, has shown that this so-called uterine milk is a post-mortemproduction, not present directly after delivery; that the serous portion is derived from thevilli, and the formed elements from the exochorial cells. f Turner, op. cit, pp.
. The science and art of midwifery. ary tubes into the substance of the placenta from itsmaternal surface. The fluid consisted of serum, of some of the formed elements of theblood, and of a multitude of spherical bodies which he regarded as analogous to milk glob-ules. Werth, however, Ueber die sogenannte Uterinmilch des Menschen, Arch, , Bd. xxii, p. 233, has shown that this so-called uterine milk is a post-mortemproduction, not present directly after delivery; that the serous portion is derived from thevilli, and the formed elements from the exochorial cells. f Turner, op. cit, pp. 155, 156. DEVELOPMENT OF THE OVUM. 57 partitions from the serotina extend downward for a considerabledistance, though never, except near the borders, as far as the cho-rion. Sections through the hardened placenta show that the main villoustrunks divide at a short distance from the chorion. The secondarybranches assume a radiate direction, from which proceed tertiarybranches, which terminate in club-shaped extremities and bury them-. Fig. 51.—Diagram showing the branching of the villi and the connection of the larger trunkswith the placenta, a, chorion ; b, primary trunk, with radiate branches (c); a, the ter-tiary branches, which either directly, or after previous division^), penetrate the pla-centa materna (/). The free terminal tufts (e) are indicated only at a few points.(Langhans.) selves in the serotina. From these tertiary branches fine lateral ones,having a dendritic arrangement, are given oh*, and fill the spaces be-tween the tertiary trunks. Many of these lateral tufts are attached directly to the serotina,and fill up in part the interval between the larger radiate branches ;others, again, float freely in the blood-currents derived from the ma-ternal vessels.* The precise origin and nature of the vascular spaces between thevilli have been a prolific subject of discussion. In the early months,we saw, the serotinal projections extended deep down between thevilli, and c
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Keywords: ., bookcentury1800, bookdecade1890, bookidsci, booksubjectobstetrics
