The principles and practice of obstetrics . lton.) tually ruptures. According to most physiologists, thisrupture takes place periodically, at the time of men-struation ; it seems, however, reasonable to suppose thatthe thin membranes of this enlarged vesicle may breakat other times under the influence of sexual ovum, with a portion of the fluid contents of thevesicle, escapes into the cavity of the peritoneum insome few cases, but more frequently the ovum passesinto the Fallopian tube. This deposit in the tube hasbeen called oviposition. After the escape of the ovum, the ovisac,
The principles and practice of obstetrics . lton.) tually ruptures. According to most physiologists, thisrupture takes place periodically, at the time of men-struation ; it seems, however, reasonable to suppose thatthe thin membranes of this enlarged vesicle may breakat other times under the influence of sexual ovum, with a portion of the fluid contents of thevesicle, escapes into the cavity of the peritoneum insome few cases, but more frequently the ovum passesinto the Fallopian tube. This deposit in the tube hasbeen called oviposition. After the escape of the ovum, the ovisac, althoughdiminished in size, is large, owing to the effusion ofblood into its cavity. This blood coagulates while thelining membrane is thrown into folds and graduallythickens. The whole tissue thus becomes firm anddense; it gradually augments in size, while the color,by the end of three weeks, becomes tawny or yellow- 11 TISSUES ORGANS OF THE PELVIS. ish, hence it ia called a . Dr. Dalton maintains, that at th ks it measures Fig. Ovary cut open, showing Corpus Luteum divided longitudinallj, throeweeks utter menstruation; from a girl dead of haemoptysis. (After Dalton.) three-quarters of an inch in length by half an inch indepth, and at this period there is no difference be-tween the corpus luteum of the unimpregnated andpregnant woman. Others, however, have describedthe virgin corpus luteum as much smaller, and some-hardly perceptible. Dr. Dalton declares that in Fig. 12.
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