Anatomy of the bladder and outlet The interior of the bladder Main articles: Urinary bladder and Urethra The main organs involved in urination are the urinary bladder and the urethra. The smooth muscle of the bladder, known as the detrusor , is innervated by sympathetic nervous system fibers from the lumbar spinal cord and parasympathetic fibers from the sacral spinal cord. Part of the urethra is surrounded by the male or female external urethral sphincter , which is innervated by the somatic pudendal nerve originating in the cord, in an area termed Onuf's nucleus. Further along the urethra is a sphincter of skeletal muscle, the sphincter of the membranous urethra external urethral sphincter. The bladder's epithelium is termed transitional epithelium which contains a superficial layer of dome-like cells and multiple layers of stratified cuboidal cells underneath when evacuated.
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Other variations include arousal from wetting or seeing someone else urinate in their pants or underclothes, or wetting the bed. Other forms of urolagnia may involve a tendency to be sexually aroused by smelling urine-soaked clothing or body parts. In many cases, a strong correlation or conditioning arises between urine smell or sight, and the sexual act. Urolagnia is sometimes associated with, or confused with, arousal from having a full bladder or a sexual attraction to someone else experiencing the discomfort or pain of a full bladder, possibly a sadomasochistic inclination.