As the bladder of cat is covered by a tunica serosa down to the cervix, the plexus vesicalis formed in the subserosa is far poorer in development than that in human bladder, but we find ganglia formed in it here and there. The nerve bundles forming this plexus mainly consist in fine vegetative fibres, but quite as in human bladder, they contain also some sensory fibres. The plexus vesicalis passes over into the plexus muscularis and ganglia are demonstrable also in the latter, It is of interest that ganglia are similarly found in the plexus submucosus too.The nerve cells in the above ganglia are much worse developed than the same in the human bladder, but always can be classified into ones of the DOGIEL's two types and thus must belong to the sympathetic nerve system. Some of the nerve cells Type I are indeed only weakly developed, but some better-developed ones resemble the SATO's so-called jelly-fish type or octopus type cells. In the cat bladder, as in all other places, the vegetative nerve fibres always end in the STOHR's terminal reticulum.The existence of sensory terminations was proved in the bladder of cat too. The largest number of them are found in the cervix vesicalis, but they are far smaller in quantity than in man and even smaller than in dog. They are also far simpler in formation than in human or canine bladder. PACINIan bodies, however, though found only in a very limited number in man and dog, are found in a quantity in the feline bladder, and interestingly enough, beside in the submucosa, also in a rather large number in the muscularis. Frequently, these PACINIan bodies are of large size.Only a very limited number of sensory fibres run into the submucosa of the bladder of cat, but since they are all very thick myelinated ones, it is not difficult to detect them. Their terminations are always much simpler than those in human and canine bladders, but are rather specific in form, that is, in the cat bladder, they never form corpuscular nor complex branched endings, but here the fibres, upon reaching into the propria from the submucosa, lose their myelin sheaths and run nearly vertically toward and mostly into the epithelinm usually without undergoing ramification, but bifurcating on rarer occasions, to end sharply or bluntly as intraepithelial fibres.The innervation of the pars membranacea urethrae of cat is rather notably strong. In particular, the sensory fibres here are far more abundant than in the bladder and their terminations are constructed far more complexly. The vegetative fibres here originate in the plexus around the ductus deferens or the ductus ejaculatorius and terminate here too in the STOHR's terminal reticulum.The sensory fibres in this part run chiefly from the lateral sides into the pars membranacea, then proceed into the submucosa through the muscularis, and send out many fine branches into the propria and also some into the muscularis in their courses. No genital nerve bodies and small-sized PACINIan bodies, such as often found in the mucous membrane of the pars prostatica and the pars interglandularis, can be found in this part, but PACINIan bodies are frequently found in the subserosa or the adventitia.The sensory terminations in the mucoua partis membranaceae are mainly of branched type, either simple or complex. The largest majority of these are formed passing over from the propria to the epithelium, and form intraepithelial terminations. Most of these terminations originate in very thick fibres and their branches often run peculiar winding courses showing change in size and end usually in sharp but occasionally also in blunt points. The intraepithelial terminations in this part are more complex and more powerful than those in the pars prostatica and the pars interglandularis (MORI). This is perhaps owing to the taller stratified cylinder epithelium lining this part, in comparison with that in the prostatical or the interglandular parts.