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Basic Geography

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[ Back ] [ Up ] [ Next ] One doesn't venture into a strange neighborhood without a road map or at least some fairly clear directions. By the same token, it is not at all wise to go poking around inside the human body in areas you can't see without some idea of the internal "geography" or anatomy. Urine has its origin in the kidneys, where it is the product of a complicated filtration process which removes unwanted elements along with excess water from the blood. Notice that the term used was "unwanted elements." In a healthy person, the blood is sterile (devoid of microorganisms). Since the urine is filtered from the blood, in a healthy person it also is sterile,  along with the channels and cavities which carry it out of the body. The urine travels downward from the kidneys via the ureters (two small tubes) to the bladder. A special valve-like arrangement in the wall of the bladder helps to prevent urine from flowing backward from the bladder to the kidneys; however, in some situations, such as an extremely full bladder, this system is not fail-safe. Two "sphincter" muscles (round, donut-shaped muscles which are capable of contracting and closing off a tube or opening) are located at the prostate, which surrounds the urethra right below the bladder (more about that later), and control the flow of urine down through the urethra which extends all the way from the bladder through the lower abdomen and through the penis, terminating at the urethral "meatus" (the piss hole). The sperm, as we all know, are manufactured in the testes (I don't think I need get too thorough in my description of their location) and travel upward through the vas deferens to the prostate. Here sperm are added to the bulk of the fluid portion of semen, which is manufactured in the prostate and associated apparatus in the prostate area. At orgasm and ejaculation, waves of muscle contraction carry the semen down the same urethra which normally carries urine. During sexual arousal, prior to orgasm and ejaculation, various things happen to prepare the urethra for conducting the semen out of the body for whatever purpose it is to serve. The sphincter muscles mentioned above contract in such away as to prevent urine from entering the urethra, as the acidity of the urine would kill sperm. In addition, the Cowper's glands secrete an alkaline solution into the urethra both to serve as lubricant (pre-cum) and to neutralize any acidity left in the urethra from urine. The accompanying illustration should give the reader some conception of the "geography" of the urethral tract; however, there are some other things that need to be known by the uninitiated about this, uncharted area. The entire tract, from the urethral meatus all the way up, must be considered sterile, and to some degree, vulnerable. Mother Nature has provided an excellent mechanism whereby the whole system is washed out several times a day by a sterile, slightly acid solution called urine, making it a difficult area for infection to obtain a "foothold". However, it’s still a dark, warm, moist cavity--a place that no self-respecting bacteria, fungus, virus, or other pathogen would avoid, and one where they can flourish once they get that first "foothold." [ Back ] [ Up ] [ Next ]

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basicgeo.htm: Last revised: December 15, 2004 by webmaster