Development of the Urogenital System of the Dog
DEVELOPMENT OF THE UROGENITAL SYSTEM OF THE DOG MAJID AHMED AL-RADHAWI LICENCE, Higher Teachers' Training College, Baghdad, Iraq, 1954 A. THESIS submitted in partial fulfillment of the requirements for the degree MASTER OF SCIENCE Department of Zoology KANSAS STATE COLLEGE OF AGRICULTURE AND APPLIED SCIENCE 1958 LD C-2- TABLE OF CONTENTS INTRODUCTION AND HEVIEW OF LITERATURE 1 MATERIALS AND METHODS 3 OBSERVATIONS 5 Group I, Embryos from 8-16 Somites 5 Group II, Embryos from 17-26 Somites 10 Group III, Embryos from 27-29 Somites 12 Group 17, Embryos from 34-41 Somites 15 Group V , Embryos from 41-53 Somites 18 Subgroup A, Embryos from 41-<7 Somites 18 Subgroup B, Embryos from 4-7-53 Somites 20 Group VI, Embryos Showing Indifferent Gonad 22 Group VII, Embryos with Differentiatle Gonad 24 Subgroup A, Embryos with Seoondarily Divertioulated Pelvis ... 25 Subgroup B, Embryos with the Anlagen of the Uriniferous Tubules . 26 Subgroup C, Embryos with Advanced Gonad 27 DISCUSSION AND GENERAL CONSIDERATION 27 Formation of the Kidney .... 27 The Pronephros 31 The Mesonephros 35 The Metanephros 38 The Ureter 39 The Urogenital Sinus 4.0 The Mullerian Duot 40 The Gonad 41 1 iii TABLE OF CONTENTS The Genital Ridge Stage 41 The Indifferent Stage , 41 The Determining Stage, The Testes . 42 The Ovary 42 SUMMARI , 42 ACKNOWLEDGMENTS 46 LITERATURE CITED 47 APJENDEC 51 j INTRODUCTION AND REVIEW OF LITERATURE Nephrogenesis has been adequately described in only a few mammals, Buchanan and Fraser (1918), Fraser (1920), and MoCrady (1938) studied nephrogenesis in marsupials. Keibel (1903) reported on studies on Echidna Van der Strioht (1913) on the batj Torrey (1943) on the rat; and Bonnet (1888) and Davles and Davies (1950) on the sheep.
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