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File:Image from page 448 of "The evolution of man- a popular exposition of the principal points of human ontogeny and phylogeny. From the German of Ernst Haeckel" (1897) (14758747146).jpg

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Identifier: evolutionofmanpo021897haec Title: The evolution of man: a popular exposition of the principal points of human ontogeny and phylogeny. From the German of Ernst Haeckel Year: 1897 (1890s) Authors: Haeckel, Ernst Heinrich Philipp August, 1834-1919 Subjects: Evolution Embryology, Human Anatomy, Comparative Human beings -- Origin Embryology Evolution Publisher: New York, D. Appleton and Co. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library


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Text Appearing Before Image: ive kidneys, whichin non-amnionate Vertebrates persist throughout life as theurine-secretory organ, are superseded by the secondarykidneys. The actual primitive kidneys disappear almostentirely in the embryo at an early period, leaving but smalltraces. In the male Mammal the supplementary testis(epididymis) develops from the upper part of the primitivekidney ; in the female the same part gives rise to a uselessrudimentary organ, the supplementary ovary {parovarium) In the female Mammal the Miillerian ducts undergo veryconsiderable changes. The actual ovaries develop only fromits upper part; the lower part widens out into a spindle-shaped pouch, with a thick, fleshy wall, within which thefertilized e^g develops into the embryo. This pouch is thewomb {uterus). At first the two uteri are perfectlyseparate, and open on each side of the urine-bladder {vu)into the cloaca, as is yet permanently the case in thelowest living Mammals, the Beaked Animals {Ornithostoma); 4i8 THE EVOLUTION OF MAN.

Text Appearing After Image: but even in Pouched Animals {Marsupialla) a connectionforms between the two Miillerian ducts, and in PlacentalAnimals they coalesce below with the rudimentary Wolffian ducts, forming with them a singlesexual cord {funiculus geni-talis). But the original indepen-dence of the two parts of theuterus, and of the two vatrinacanals Avhich proceed out of theirlower extremities, persists in manylower Placental Animals, while inthe higher members of the samegroup, these organs graduallycoalesce to form one sino-le orsfan. FfG. 327.—Female sexual The proceSS of COaleSCence ad-organs of a Beaked Animal yanccs steadily from below (or (Ornithorhi/nchtis, Figs. 195, i i • in t / n 196) : 0, ovaries; t, oviduct; from bchmd) upwards (or for-w, uterus; sng, urinary sexual wards). While in many Gnawing cavity (slnnsurogerntaUs)-, the ^^i^^.^i^ {Bode7ltia, e.g., HareS andtwo parts or the uterus open ^ u into this at u: cl, cloaca. Squirrels) two separate uteri open(After Gegenbaur.) ^^^^ ^-^^ vagina


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Source Image from page 448 of "The evolution of man: a popular exposition of the principal points of human ontogeny and phylogeny. From the German of Ernst Haeckel" (1897)
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