492 



THE URINARY APPARATUS. 



fundus, and present, on their free border, a thick cord, the obliterated 

 umbilical artery. 



Owing to this disposition of the peritoneum, the bladder is divided into 

 two perfectly distinct regions : an anterior, enveloped by a serous layer ; 

 the other, posterior, is brought in contact with the surrounding organs 

 through the medium of the loose and abundant cellular tissue of the pelvic 



Fig. 253. 



THE KIDNEYS AND BLADDER IN THE FCETUS OF SOLIPEDS. 



A, Supra-renal capsules ; B, Kidney ; 6, Ureter ; C, Bladder ; D, Urachus. 1, 

 Abdominal aorta ; 2, External iliac artery ; 3, Umbilical artery ; 4, Umbilical 

 vein. 



region. This tissue, constantly mixed with adipose masses around the neck 

 of the bladder, submits, with the serous membrane of the anterior region, to 

 the changes in form and continual displacements of the urinary sac. 



