Sensory terminations are formed in the propria mucosae and the epithelium in the basal part of the bladder of rabbit, as in man and in all the other mammals examined hitherto. But in rabbit, they are small in number and consist only in simple branched or unbranched terminations.In the urethra of male rabbit are found a rather large number of sensory terminations, as follows.In the proximalmost area of the pars ampullovesicalis urethrae, branched terminations originating in medium- or large-sized sensory fibres are found in the propria rich in longitudinal smooth muscle fibres and the mostly transitional epithelium. Their terminal fibres are often very thick and show frequent change in size, and mostly run irregular winding courses common to such fibres.In the next pars prostatica urethrae are found a somewhat larger number of sensory terminations than in the preceding, but their form is still of the simple branched type mostly ending in the inner layer of the propria, no corpuscular terminations being found here either. Often enough the terminal fibres end intraepithelially. Branched terminations are not rare in the outer layer of the propria rich in longitudinal smooth-muscle fibres, either. The thrminations found in this part nearly resemble those in the foregoing part in type.In the pars muscularis urethrae of rabbit, the m. urethralis being devoid of the inner circular smooth muscle layer, no such very peculiar-shaped complex branched terminations as found in that layer of cat and dog could be detected. Neither could be found the genital nerve bodies discovered in the m. urethralis of goat. The sensory fibres run through the outer layer rich in longitudinal smooth muscle fibres of the propria into the inner layer of the propria composed of loose connective tissue, and end always in unbranched or branched terminations formed subepithelially or intraepithelially. They resemble those in the pars prostatica in construction, but the branched ones are generally somewhat more complex.The sensory fibres from the nn. dorsales penis distributed in the wall of the proximal half of the pars cavernosa urethrae surrounded by the very well-developed cavernous plexus are much more numerous in rabbit than in cat, goat and mole, but never form corpuscular terminations as in dog, but end only in unbranched and simple branched terminations. The terminal fibres are thick, show frequent change in size and run, besides the usual winding courses, rather often glomerular courses, before spreading out to end subepithelially and intraepithelially.A considerable number of sensory fibres are found in the distal half of the pars cavernosa nurethrae, but their terminations are still simpler than in the proximal half above, particularly in the urethral wall running through the glans penis; only unbranched and simple branched terminations composed of medium- or small-sized terminal fibres, ending subepithelially or intraepithelially, are found here.The sensory nerve supply of the prostata, the unpaired seminal vesicle, the paired ductus deferentes and their ampullae in rabbit shows a considerable difference from that in man and many other animals, owing to the peculiar relative positions and constractions of these organs in the former. No sensory terminations could be found in the parenchyma of the prostata, but some were found around the 4 main gland ducts, especially, in its distal area. The terminations, however, are merely of the unbranched and the simple branched types formed by large- and medium-sized stem fibres mostly beneath but not rarely in the epithelium.Very few sensory fibres run into the ductus deferentes and their ampullae, but in the seminal vesicle, especially, in its distal area, are found a rather large number of sensory fibres ending in the muscularis, the propria and further up in the epithelium.