200 



UKOGENITAL SYSTEM 



upwards through the abdominal ring to the lower part of the epididymis. Bound 

 its attachment to the subcutaneous tissue a thickening is formed which includes 

 muscular fibres from both transversalis and internal oblique muscles. The 

 formation of this mass seems already initiated even at so early a stage as that 



allantois hind-gut 



B 



bladder septum hind-gut 



tail-gut 



bladder hind-gut 



hind-gut 



genital cloacal 

 papilla plate 



anal depression 



genital papilla cloacal plate 



FlG. 253. DlAGBAMS REPRESENTING FOUR STAGES IN THE DEVELOPMENT OF THE CLOACA 

 ENTODERMICA, THE CLOACAL PLATE, AND GENITAL PAPILLA. (T. H. Bryce.) 



figured in fig. 247, p. 195. The muscular tissue forming this inguinal cone 

 occupies the base of the inguinal pouch, and it is by the outward growth of the 

 mass that the outpushing of the abdominal wall is produced, and the processus 

 vaginalis is carried down into the scrotum. When the processus vaginalis is 

 formed, the gubernaculum lies behind the serous sac. The descent of the testicle 



