Archive image from page 1361 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 1328 THE UKINO-GENITAL SYSTEM. niesonephros atrophies, yet some the pronephros is a vestigial organ, and its development in all higher vertebrates is very incomplete. It disappears almost as soon as it is formed, and it is replaced by the far more important mesonephros. With the development of the permanent kidney the of its tubules persist in the adult. The ductuli efferentes, the ductuli aberrantes, and the rudimentary paradidymis (organ of Giraldes
Archive image from page 1361 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( 1328 THE UKINO-GENITAL SYSTEM. niesonephros atrophies, yet some the pronephros is a vestigial organ, and its development in all higher vertebrates is very incomplete. It disappears almost as soon as it is formed, and it is replaced by the far more important mesonephros. With the development of the permanent kidney the of its tubules persist in the adult. The ductuli efferentes, the ductuli aberrantes, and the rudimentary paradidymis (organ of Giraldes) in the male, and the rudimentary tubules of the ep-oophoron and of the paroophoron in the female, are structures which owe their origin to the tubules of the mesonephros. Soon after the formation of the Wolffian ducts two other longitudinally disposed canals, called the Miillerian ducts, are developed. These open at their cephalic ends into the body cavity, and at their caudal ends, unlike the Wolffian ducts, they unite with one another in the median plane. From them are formed, in the female—the uterine tubes, the uterus, and the 1 vagina; and in the male—the appendices of the testis _£and the utriculus prostaticus. The Wolffian and Miillerian ducts open at their caudal ends into the ventral or urogenital part of the cloaca, which in the course of development becomes transformed into the bladder and the urino-genital canal of the embryo. The developing ureter at first arises as a diverticulum from the Wolffian duct, at a short distance from the point where the latter joins the cloaca. Soon, however, the ureters acquire inde- pendent openings into the cloaca, which become gradu- ally shifted further from one another and from those of the Wolffian ducts. The ureters are now found to open into the anterior portion of the cloaca which lies nearer to the head of the embryo than the part with which the Wolffian ducts are connected. This cephalic portion of the anterior subdiv
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