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That is, instead of being born like the bird's egg and then being hatched, these eggs first develop and afterwards are born. But if not fertilized they would not continue to develop. The cat has two ovaries, which develop at maturity and ripen the ova, and these pass into the oviducts, which are tubes like the oviducts of the bird.
In the adult form it attaches itself to the mucous membrane of the fourth stomach or abomasum, and lives by sucking blood. The blood present in the digestive tract of the worm gives it a brown color, and the white oviducts which are wound around the digestive canal cause the body to appear twisted.
They would have the embryos and germs of one's thoughts out of the mental oviducts, and cannot wait for their spontaneous evolution and extrusion. The story I have promised is, on the whole, the most remarkable of a series which I may have told in part at some previous date, but which, if I have not told, may be worth recalling at a future time.
Internally there were two oviducts, that of the left side normally developed, that of the right diminutive and less than half the full length. The gonad of the left side had the tubular structure of a testis, but showed no signs of active spermatogenesis, but in its lower part contained two ova. Camb. Univ.
The cavity inside the womb communicates above with the two oviducts and terminates below in a canal which runs through the neck and opens into the vagina by an orifice known as the mouth of the womb. Pregnancy modifies every portion of the womb in one way or another; but the most profound alterations occur in the body, in the cavity of which the ovum has come to rest.
There are two ovaries, with their oviducts, in the young bird, but these are so small that it is very difficult indeed to find them. As the bird approaches maturity, one ovary and its oviduct enlarge, and the ova, which develop from the inside of the ovary just as the ovule develops inside the flower ovary, also become large.
The Mullerian ducts undergo very important changes in the female mammal. The oviducts proper are developed only from their upper part; the lower part dilates into a spindle-shaped tube with thick muscular wall, in which the impregnated ovum develops into the embryo.
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.
They would have the embryos and germs of one's thoughts out of the mental oviducts, and cannot wait for their spontaneous evolution and extrusion. The story I have promised is, on the whole, the most remarkable of a series which I may have told in part at some previous date, but which, if I have not told, may be worth recalling at a future time.
In this way, it is made sure that some of them will travel up through the uterus and oviducts, arriving in the neighborhood of the ovaries. FERTILIZATION. Convincing observations upon the lower forms of life, especially upon fishes, have shown that when the germinal cells come near to each other, the ovum attracts the spermatozoon.
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