 The nerves composing it are of large size.They are distributed to the prostate seminal vesicle and the corpora cavernosa of the penis and urethra.The nerves supplying the corpora cavernosa consist of two sets, the lesser and greater cavernous nerves, which arise from the forepart of the prostatic plexus, and, after joining with branches from the pudendal nerve, pass forward beneath the pubic arch.