1208 



PHYSIOLOGY 



by two main trunks, the hypogastric nerves, into the pelvis on each side of 

 the rectum and ends in a plexus, the hypogastric plexus, at the base of the 

 bladder. From this plexus fibres pass to the bladder wall. The pelvic 

 visceral nerves are derived from the second and third sacral nerves. They 

 make no connection with the sympathetic system, but pass directly to the 



3rd lumb vert. 



Sup. mes. ganglion 



Sup. mes. nerves 



Median mes. nerves 



Inf. mes. nerves ,. 



Inf. mes. ganglion . 



Hypogastric nerves 



Rectum 



Bladder . . . 

 Femur ._ 



Iscbium 

 Urethra . 



FIG. 662. Nerve supply to bladder of cat. (NAWBOCKI and SKABITSCHEWSKY.) 



hypogastric plexus and are carried with branches of this plexus to the neck 

 of the bladder. The fibres do not run directly from the spinal cord to their 

 ending in the bladder wall, but make connection with cells situated peri- 

 pherally, partly in the hypogastric plexus, but chiefly in the walls of the 

 bladder itself. Both sets of fibres supply also the rectum and the colon, 

 and carry efferent impulses to the bladder. Afferent impulses from the 

 bladder travel chiefly in the pelvic visceral nerves. 



