The vascular, nerve and lymphatic supply of the male urethra
The major part of the blood supply of the male urethra is provided by branches of the inferior vesical vessels. The nerve supply, in particular that relating to the sphincter mechanisms in the prostatic and membranous urethra, relate to the autonomic nerves from sacral segments of the spinal cord. The muscles surrounding the bulb and proximal part of the anterior urethra are also innervated by branches of the pudendal nerve. The lymphatic drainage of the posterior urethra, mainly in association with the prostate gland, is to the pelvic lymph nodes. Lymphatic drainage of the anterior urethra is mainly superficial, and involving the inguinal lymph nodes in the groin.