Volume 1

Descriptive catalogue of the preparations in the museum of St. Thomas's Hospital.

Date:
1847-59
Catalogue details

Licence: Public Domain Mark

Credit: Descriptive catalogue of the preparations in the museum of St. Thomas's Hospital. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    261. A similar preparation from another Toad, showing the same kind of cluster of ova, as those mentioned in No. 260. 262. Two ova from a Sheep. 263. An ovum from a Sheep, with a portion of the granular con- tents of the Graafian vesicle. The zona pellucida is remark- ably distinct, surrounding the yolk, which is filled with finely granular matter. 264. A portion of the cotyledon of a Cow, injected. 264a. Tufts and villi of the chorion, taken from an ovum of the third week, showing their subdivisions and ramifications, previously to their reception of the umbilical blood vessels. The external membrane is seen to be composed of minute irregu- larly disposed fibres, connected by thin membrane, and en- closing nucleated cells mixed with granular matter. 264b. A portion of the human placenta of the full period, injected, showng the entire thickness of the organ from its foetal to its uterine sui-face. The umbilical arteries after dividing and subdividing on the foetal surface of the placenta, beneath the amnion, are seen dipping at various parts into its substance where they very minutely ramify; and, at length terminate by becoming continuous with the minute radicles of the umbilical vein, forming an immense number of terminal and highly convoluted capillary loops, adapted to, and lodged within the tubular shcatlis of the chorion. The great peculi- arities recognisable in these vessels, are two ; first, the striking predominance of the capillary branches over the trunks from which they spring, and second, their extreme tortuosity, cir- cumstances which must very much retard the velocity of the circulation. 264c. A portion of the same placenta, in which the tufts have been separated by merely moving tlie part briskly in water, show- ing very cloiirly the dendritic ])rocesses of the cliorion, and the extremely tortuous vessels whicli they euolose.
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