A synoptical guide to the study of obstetrics : being an aid to the student in the class-room, in private study and in preparing for examinations / by Robert Barnes.

Date:
1883
Catalogue details

Licence: Public Domain Mark

Credit: A synoptical guide to the study of obstetrics : being an aid to the student in the class-room, in private study and in preparing for examinations / by Robert Barnes. Source: Wellcome Collection.

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

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    PLACENTA. Strength.—May support a weight of 10 to 20 pounds or more, therefore more than average weight of child ; but it has broken under weight of child. Attachments.—By one end to foetus at umbilicus , by othei to foetal surface of placenta in centre or on margin or in inter- mediate positions, governed by seat of attachment of placenta to uterus. Central when placenta is attached to fundus, it spiings from lower edge when placenta dips into the lower polar circle. The seat occupied by placenta is determined by noting the distance of the rent made in the membranes by the child at birth. This rent is over the os internum (Levret ; B. B.). Deviations in form of placenta and cord.—1. The cotyledons are separate, or one or more are detached from main body. Vessels run across intervening chorion-spaces to communicate ; placentae succenturiatce. 2. Diffused placentae covering the whole or large part of chorion. Deviations typified in placenta of other mammalia. Cord may be excessively thick from excess of Wharton’s jelly; presenting tumours; knots; from opening of umbilicus it may admit foetal intestine. Area of placenta—A) to 70 square inches. Area of placental seat when placenta is cast, 10 to 16 square inches (B.. B.). Placenta is attached to uterus by—(1) decidua; (2) vessels passing between; and (3) slightly by chorion-villi running into uterine sinuses. These bonds are all delicate; separation is effected by reduction of uterine surface from coincidence with area of placenta to the area found after expulsion of contents. Nerves and Vessels of Uterus. Nerves come from renal plexus and inferior mesenteric; others from hypogastric plexus, sacral plexus, from ganglia of great sympathetic. Arteries from hypogastric become uterine arteries; utero- ovarian artery. They all anastomose; the helicine disposition;