Testicular Descent in the Dog

摘要: The mechanism underlying the process of normal testicular descent in dog has been examined by a morphological, histological and histochemical analysis testis gubernaculum during period from 53rd day post coitum (p. c.) until 40th partum p.). Within this period, passes inguinal canal on third or fourth p. reaches its scrotal location 35th During entire composition (volume percentage seminiferous tubules, volume Leydig cells, diameter number germ cells) is fairly constant. △5-3β-hydroxysteroid dehydrogenase activity cells before birth suggests steroid synthesis. Outgrowth swelling occurs fifth but data indicate an onset gubernacular regression last phase outgrowth reaction. migration caudal end kidney towards associated with gubernaculum; regression, moves ultimate pouch.