Abstract
The development of nerve plexus in the adventitia, the muscularis and the submucosa of the urethra in a female dog is very poor. They consist of numerous vegetative nerve fibres and a small number of medullated sensory fibres. The termination of the former always consists in the terminalreticulum, which is conspicuously formed in the muscularis and around the venous plexus in the submucosa and the propria.
The sensory fibres here are more numerous than in the canine bladder (WATANABE), forming terminations in the propria and intraepithelially. In the propria, we find unbranched, simple branched and glomerular terminations. The unbranched and branched terminations mostly are formed by medium-sized fibres of uniform thickness, but in some cases of thick fibres undergoing change of size in their courses. The glomerular terminations are larger in number and somewhat more complex in structure than in the canine bladder (WATANABE). They are principally of capsulated type and originate in thick fibres. They are to be looked upon as belonging to the type II of genital nerve corpuscles.
More intraepithelial fibres are found in the canine female urethra in its transitional and stratified columnar epithelia, than in a canine bladder. Mostly, they are unbranched, but in some cases they are ramified into two or three branches each. In most cases, they run through the basal or median layer of the epithelium in wavy courses to end in sharp or blunt points. These intraepithelial fibres generally consist in thin or medium-sized fibres, but sometimes, in thick fibres changing their size in their courses.
