The American journal of anatomy . - reiterateshis statements of 1894. The inspection of the tail end of human THE CLOACA IN HUMAN EMBRYOS 5 embryos of 11-13 mm. length reveals an oval pit extending fromthe coccygeal prominence to the tip of the genital pit (cloaca) receives the openings of the gut dorsally, and theCanalis urogenitalis ventrally; the two separated by a partitionof some mm. thickness. The Wolffian and Miillerian ductsopen higher up in the Canalis urogenitalis and will not be con-sidered in the description of this depression. The Canalis uro-genitalis and the gu
The American journal of anatomy . - reiterateshis statements of 1894. The inspection of the tail end of human THE CLOACA IN HUMAN EMBRYOS 5 embryos of 11-13 mm. length reveals an oval pit extending fromthe coccygeal prominence to the tip of the genital pit (cloaca) receives the openings of the gut dorsally, and theCanalis urogenitalis ventrally; the two separated by a partitionof some mm. thickness. The Wolffian and Miillerian ductsopen higher up in the Canalis urogenitalis and will not be con-sidered in the description of this depression. The Canalis uro-genitalis and the gut open into this pit (cloaca) which would reach(comparing with adult relations) from the dorsal border of theanus to the ventral border of the urethral opening { Frenulumclitoridis). Later he states: In what manner the division ofthe cloaca is accomplished is not perfectly understood either inman or in mammals. I found the relations in the j^oungest human. Fig. 1 embryo that I had opportunity to examine like those picturedin fig, 1, naturally with exception of the form of the commit myself therefore, as far as the human embryo is con-cerned, to the view of Rathke which has recently been substan-tiated by Retterer and von Mihalcovics in the animals. The work of von Mihalcovics i/85) referred to, says in part;This septum between the urogenita canal and the gut arisesin part through increase in length of the afore-mentioned perinealTold (septum) to which, distalward, two lateral folds join to theperineal folds. The cloaca takes no part in the formation of theurogenital canal. The opinion of Retterer (94), mentioned byNagel, is summarized as follows: In the guinea pig, as in othermammals studied up to the present time (man, pig, sheep and rab- () AUGUSTUS G. POHLMAN bit), a fold of mesoderm appears at the cephalic extremity of eachlateral cloacal wall, and extends little by little toward the caudalend of the cloaca. These lateralamericanjournalo12wist
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
