The development of the human body; a manual of human embryology . while the left curves beneath thearch of the aorta (see Fig. 139). LITERATURE. E. GoppERT: Ueber die Herkunft der Wrisbergschen Knorpels, , xxi, 1894. W. His: Zur Bildungsgeschichte der Lungen beim menschlichen Em-bryo, Archix jilr Anat. und Physiol., Anat. Abth., 1887. E. Kaiaius: Beitrage zur Entwickelungsgeschichte des Kehlkopfes,Anat. Hefte, IX, 1897. E. Kaiaius: Die Entwickelung des menschlichen Kehlkopfes, Ver-handl. der Anat. Gesellsch., xn, 1898. A. Narath: Der Bronchialbaum der Saugethiere und des Mensch
The development of the human body; a manual of human embryology . while the left curves beneath thearch of the aorta (see Fig. 139). LITERATURE. E. GoppERT: Ueber die Herkunft der Wrisbergschen Knorpels, , xxi, 1894. W. His: Zur Bildungsgeschichte der Lungen beim menschlichen Em-bryo, Archix jilr Anat. und Physiol., Anat. Abth., 1887. E. Kaiaius: Beitrage zur Entwickelungsgeschichte des Kehlkopfes,Anat. Hefte, IX, 1897. E. Kaiaius: Die Entwickelung des menschlichen Kehlkopfes, Ver-handl. der Anat. Gesellsch., xn, 1898. A. Narath: Der Bronchialbaum der Saugethiere und des Menschen,Bibliotheca. Medica, Abth. A, Heft 3, 1901. CHAPTER XIII. THE DEVELOPMENT OF THE URINOGENITALSYSTEM AND THE SUPRARENAL BODIES. The excretory and reproductive systems of organs areso closely related in their development that they must beconsidered together. They both owe their origin to themesoderm which constitutes the intermediate cell-mass,this, at an early period of development, becoming thick-ened so as to form a ridge projecting into the dorsal por- nc. Fig. 194—Transverse Section through the Abdominal Region op a Rabbit Embryo of 12 , Aorta ; g/, glomerulus; gr, genital ridge; m, mesentery; nc, notochord;t, tubule of mesonephros; wd, Wolffian duct; wr, Wolffian ridge.— (Mihalkovicz.) tion of the ceelom and forming what is known as the Wolf-fian ridge (Fig. 194, wr). The greater portion of the sub-stance of this ridge is concerned in the development of theprimary and secondary excretory organs, but on its mesialsurface a second ridge appears which is destined to giverise to the ovary or testis, and hence is termed the genital ridge (g). 360 THE PRONEPHROS. 361 The development of the excretory organs is remarkablein that three sets of organs appear in succession. Thefirst of these, the pronephros, exists in a very rudimentarycondition in the human embryo, although its duct, thepronephric or Wolffian duct, undergoes complete develop-ment and plays an important par
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