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Updated: June 20, 2025
If any special substances are given off by the embryos in the uterus in ordinary gestation, the same substances would continue to be given off by the embryos in the marsupial pouch, and these must be absorbed by the skin of the pouch. In this way it seems to me we have a logical explanation of the fact that the corpora lutea in the Marsupial are not absorbed at parturition as in Eutheria.
Duriora genti corpora, stricti artus, minax vultus et major animi vigor.
Numbers of ova die without reaching maturity, the follicular cells degenerate, and the follicle becomes filled with the cells of the theca interna, which have a resemblance to those of the true corpus luteum. These degenerate follicles have been termed spurious corpora lutea, or atretic vesicles. The interstitial cells are the remains of these atretic vesicles.
O'Donoghue, however, concludes from a study of the Marsupial Dasyurus that the stimulus which upon the milk glands proceeds from the corpora lutea in the ovary. In this animal changes in the pouch occur in pregnancy, which are doubtless also due to hormone stimulation, but which we will not consider here. Journ. Mic.
C. L. Dana that, in poisoning by illuminating gas, the chief symptom is loss of consciousness, and the only lesion discovered is softening of the corpora striata; then the following: "Assuming now that it were proved that the power which creates consciousness has some definite seat, and that it is a summation of energies physiologically varying in sleep and waking, which may be directed to any part of our store of experiences for purposes of illumination, what portion of the brain is so constructed as to be in apparently intimate connection with every other?
On account of the great size of the cerebrum, the midbrain is entirely concealed from view when the other parts occupy their normal positions. The midbrain carries upon its back and upper surface four small rounded masses of cell-bodies, called the corpora quadrigemina.
It is difficult to reconcile entirely the evidence described by O'Donoghue from Dasyurus, with that obtained from higher Mammals, although on the whole there is reason to conclude that the corpora lutea have an important influence on the development of the milk glands.
Habet enim eorum perfidia, et Paganissimus, animas nobilium hominum post mortem ingredi corpora nobilium bestiarum, et animas ignobilium corpora bestiarum ignobilium et vilium, ad luenda videlicet crimina, donec peracta poenitentia transeant in Paradisum: ideoque nutriunt, prout dicunt, has nobiliores bestias, siue bestiolas, quod a quibusdam nobilibus fundabatur in principio haec Abbatia.
It seems obvious that the corpora lutea in evolution were a consequence of intra-uterine gestation, for they occur only in association with this condition, and it is impossible to suppose that a mutation could arise accidentally by which the ruptured follicles should produce a secretion which would cause the fertilised ova to develop within the oviducts.
Chamberlayne asserts the fact. Corpora et bona nostrorum subjectorum nostra sunt, said James I., of glorious and learned memory. The eyes of dukes of the blood royal have been plucked out for the good of the kingdom. Certain princes, too near to the throne, have been conveniently stifled between mattresses, the cause of death being given out as apoplexy. Now to stifle is worse than to mutilate.
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