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Prostata | Svensk Porr
From Wikipedia, the free encyclopedia
This is the latest accepted revision , reviewed on 7 July 2022 .
Gland of the male reproductive system in most mammals
This article is about the male prostate gland. For the equivalent female prostate gland, see Skene's gland . For the journal, see The Prostate .
Not to be confused with Prostrate (body position) .
A digital rectal examination may be performed to investigate how large a prostate is
A diagram of prostate cancer pressing on the urethra, which can cause symptoms
Micrograph showing normal prostate cancer in the right upper aspect of image. HPS stain . Prostate biopsy .
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The prostate is both an accessory gland of the male reproductive system and a muscle-driven mechanical switch between urination and ejaculation. It is found only in some mammals. It differs between species anatomically, chemically, and physiologically. Anatomically, the prostate is found below the bladder , with the urethra passing through it. It is described in gross anatomy as consisting of lobes and in microanatomy by zone. It is surrounded by an elastic, fibromuscular capsule and contains glandular tissue as well as connective tissue .
The prostate glands produce and contain fluid that forms part of semen , the substance that is emitted during ejaculation as part of the male sexual response . This prostatic fluid is slightly alkaline, milky or white in appearance. The alkalinity of semen helps neutralize the acidity of the vaginal tract , prolonging the lifespan of sperm . The prostatic fluid is expelled in the first part of ejaculate, together with most of the sperm, because of the action of smooth muscle tissue within the prostate. In comparison with the few spermatozoa expelled together with mainly seminal vesicular fluid, those in prostatic fluid have better motility , longer survival, and better protection of genetic material.
Disorders of the prostate include enlargement , inflammation , infection, and cancer . The word prostate comes from Ancient Greek προστάτης, prostátēs , meaning "one who stands before", "protector", "guardian", with the term originally used to describe the seminal vesicles .
The prostate is a gland of the male reproductive system . In adults, it is about the size of a walnut , [1] and has an average weight of about 11 grams, usually ranging between 7 and 16 grams. [2] The prostate is located in the pelvis. It sits below the urinary bladder and surrounds the urethra . The part of the urethra passing through it is called the prostatic urethra , which joins with the two ejaculatory ducts . [1] The prostate is covered in a surface called the prostatic capsule or prostatic fascia . [3]
The internal structure of the prostate has been described using both lobes and zones. [4] [1] Because of the variation in descriptions and definitions of lobes, the zone classification is used more predominantly. [1]
The prostate has been described as consisting of three or four zones. [1] [3] Zones are more typically able to be seen on histology , or in medical imaging , such as ultrasound or MRI . [1] [4] The zones are:
The "lobe" classification describes lobes that, while originally defined in the fetus, are also visible in gross anatomy, including dissection and when viewed endoscopically. [4] [3] The five lobes are the anterior lobe or isthmus, the posterior lobe, the right and left lateral lobes, and the middle or median lobe.
Inside of the prostate, adjacent and parallel to the prostatic urethra, there are two longitudinal muscle systems. On the front side ( ventrally ) runs the urethral dilator ( musculus dilatator urethrae ), on the backside ( dorsally ) runs the muscle switching the urethra into the ejacul
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