. Hand-book of physiology . mammiferous animals, espe-cially the bitch and rabbit: but it may be inferred that ana-logous changes ensue in the human ovum. Bischoff (clxxxvii.) describes the yelk of an ovarian ovumafter coitus as being unchanged in its characters, Avith thesingle exception of being fuller and more dense; it is stillgranular, as before, and does not possess any of the cells sub-sequently foimd in it. The germinal vesicle always disappears,sometimes before the ovum leaves the ovary, at other timesnot until it has entered the Fallopian tube; but always beforethe commencement of th
. Hand-book of physiology . mammiferous animals, espe-cially the bitch and rabbit: but it may be inferred that ana-logous changes ensue in the human ovum. Bischoff (clxxxvii.) describes the yelk of an ovarian ovumafter coitus as being unchanged in its characters, Avith thesingle exception of being fuller and more dense; it is stillgranular, as before, and does not possess any of the cells sub-sequently foimd in it. The germinal vesicle always disappears,sometimes before the ovum leaves the ovary, at other timesnot until it has entered the Fallopian tube; but always beforethe commencement of the metamorphosis of the yelk. Of themanner in which the germinal vesicle, and with it the germi-nal spot, disappears, and of the changes which they are sup-posed previously to undergo, much has been written, thoughhttle is with certainty known. The cells of the membrana granulosa, which immediatelysurround and adhere to the ovum, undergo a peculiar changeof form about the time at which the ovum is destined to leave Fig. 69.*.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectphysiology, bookyear1
