A text-book of animal physiology : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology / by Wesley Mills ... with over 500 illustrations.

T. Wesley Mills

Date:: 1889

Credit: A text-book of animal physiology : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology / by Wesley Mills ... with over 500 illustrations. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

141/750 page 109

$forming the Miillerian duct by the process of cleavage and separation referred to on preceding page. Fig. 127.—Diagrammatic representation of the genital organs of a human embryo previous to sexual distinction (Allen Thomson). W, Wolffian body; gc, genital cord; rn, Bliillerian duct; ir. Wolffian duct; ur/, urogenital sinus ; cp, clitoris or penis; i. intestine ; cl, cloaca ; Is, part from which the scrotum or labia majora are developed ; ot, origin of the ovary or testicle respectively ; x, part of the Wolffian body developed later into the coni vasculosi: 3, ureter ; 4, bladder ; .5, urachus. The future of the Miillerian and Wolffian ducts varies ac- cording to the sex of the embryo. Fio. 128.—Diagram of the maiiiinalian type of male sexual organs Cafter Quaiii). Compare with Figs. 127. 129. C, Cowt>crs glanil of one side ; cp, cf)rpora cavernosa ])fnis, cut slmrt: f. caput (•i)iiiidymiH ; (/. {.'ulMTiiaculurri ; j, rectum ; hi, hydatid of MorgaKni, the pcrsisti'iit ant*frior end of the .Mljlji-riaii duct, the cf)njoint post^-rior end.s of which form Ihf iilrnis rnatMMilirius : //r, prostaU- gland ; h, Hcrotiirri ; hji, corpus spongiosum nrclhrd'; /.testis (t<f(ticl<-i in the place of it.s original formation. The dotted line indicates tlw <lin'<'ti(in in which the t«'StiK and epididyiin'H change [dace in their descent from the abdomen into the scrotum ; rd, van deferenH; vli, van alierrans ; vh, vesicula seminalis; H', remnants of Wolffian body (the organ of (UraMiiH or paradidymiH of Waldeyer;; 'i, 4, .'>, as in Fig. 129.$