SECRETION. 



The greater the distension of the lumen of the ureter, the more 

 rapid will the number of peristaltic movements become. 



Experimentally, peristaltic movements may be aroused by elec- 

 trical or mechanical excitation; movements always begin at the point 

 excited and proceed toward both ends. 



THE URINARY BLADDER. The bladder is a musculo-membran- 

 ous pouch which serves as a temporary reservoir for the urine. Jt 



Madder. - 



Fig. 178. Diagram of Nerve-supply to Bladder. 

 (NAWBOCKI, SKABITCHEWSKY, and STARLING.) 



lies behind the pubis and within the pelvic cavity while the viscus is 

 empty, but when distended it protrudes into the hypogastric region, 

 in extreme cases even up to the umbilicus. 



In the cat, two days after section of the spinal cord above the 

 vesico-spinal center, I found that a pressure of 140 millimeters of 

 water was required to overcome the tonus of the sphincter when a 

 cannula was bound in the urethra. 



