The development of the human body; a manual of human embryology . Fig. 196.—Transverse Section ofthe Wolffian Ridge of a ChickEmbryo of Three Days. ao, Aorta; gl, glomerulus; gr, genitalridge; mes, mesentery; mt, meso-nephrie tubule; vc, cardinal vein;Wd, Wolffian duct.—(Mihalkovicz.) THE MESONEPHROS. 365 but especially because a number of secondary and tertiarytubules develop in connection with each of the primaryones. Exactly how these additional tubules arise is alittle uncertain, some observers maintaining that theyare formed from the substance of the Wolffian ridge in thesame manner as th
The development of the human body; a manual of human embryology . Fig. 196.—Transverse Section ofthe Wolffian Ridge of a ChickEmbryo of Three Days. ao, Aorta; gl, glomerulus; gr, genitalridge; mes, mesentery; mt, meso-nephrie tubule; vc, cardinal vein;Wd, Wolffian duct.—(Mihalkovicz.) THE MESONEPHROS. 365 but especially because a number of secondary and tertiarytubules develop in connection with each of the primaryones. Exactly how these additional tubules arise is alittle uncertain, some observers maintaining that theyare formed from the substance of the Wolffian ridge in thesame manner as the primary tubules with which they later. -—md nd Fig. 197.—Urinogenital Apparatus op a Male Pig Embryo of 6 , Aorta; b, bladder; gh, gubernaculum of Hunter; k, kidney; md, Mullerian duct; sr, suprarenal body; t, testis; -w, Wolffian body; wd, Wolffian duct.—(Mihalkovicz.) become connected (Mihalkovicz), while others hold thatthey are formed by the splitting of the primary tubulesor as buds from these (Braun, Janhosik). By the formation of these additional tubules and thecontinued elongation of all, whereby they become throwninto numerous convolutions, the Wolffian ridge becomesa somewhat voluminous structure, projecting markedly 366 THE DEVELOPMENT OF THE HUMAN BODY. into the coelomic cavity (Fig. 197). It is attached to thedorsal wall of the body by a distinct mesentery and has inits lateral portion, embedded in its substance, the Wolffianduct, while on its mesial surface anteriorly is the butslightly developed genital ridge (t). This condition isreached in the human embryo at about the sixth orseventh week of de
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
