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perineum

 
Dictionary: per·i·ne·um   (pĕr'ə-nē'əm) pronunciation
n., pl., -ne·a (-nē'ə).
  1. The portion of the body in the pelvis occupied by urogenital passages and the rectum, bounded in front by the pubic arch, in the back by the coccyx, and laterally by part of the hipbone.
  2. The region between the scrotum and the anus in males, and between the posterior vulva junction and the anus in females.

[Middle English, from Medieval Latin perinaeon, from Greek perinaion : peri-, peri- + inān, to excrete.]

perineal per'i·ne'al (-nē'əl) adj.

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Word Overheard: perineum
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Expectant mothers and other alt-clickers were interested to read early in May 2005 that:

"Routine use of episiotomy for uncomplicated vaginal births does not provide immediate or longer term benefits for the mother, according to a review of scientific evidence sponsored by HHS' Agency for Healthcare Research and Quality. Episiotomy is the surgical cutting of the perineum -- the skin between the vaginal opening and the anus -- and is a common procedure used in an estimated one-third of vaginal deliveries to hasten birth or prevent tearing of the skin during delivery."

Link: Routine Use of Episiotomy in Uncomplicated Births Offers No Benefits to Women

Posted May 5, 2005.

World of the Body: perineum
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The anatomical name for the ‘crotch’ region, including the anus and vulva in the female and extending from the anus to the scrotum in the male. At a deeper level, layers of muscle and connective tissue form the ‘floor’ of the pelvic cavity which is penetrated by the anal canal (from the rectum) and urethra (from the bladder), and by the vagina in the female. The bony limits of the perineum are the pubic symphysis, in front (where the two pelvic bones join), and the coccyx behind.

— Stuart Judge

See pelvis; urogenital system

Dental Dictionary: perineum
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n

The part of the body situated dorsal to the pubic arch and the arcuate ligments, ventral to the tip of the coccyx, and lateral to the inferior rami of the pubis and the ischium and sacrotuberous ligaments. The perineum supports and surrounds the distal portions of the urogenital and gastrointestinal tracts of the body.

Region of the body between the muscular floor of the pelvis and the thighs, containing the anal canal and external genitalia.

Veterinary Dictionary: perineum
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The region between the tail and the ischiatic arch, especially the region between the anus and genital organs made up of the pelvic diaphragm and associated structures occupying the pelvic outlet, bounded ventrally by the pelvic symphysis, laterally by the ischial tuberosities, and dorsally by the coccygeal vertebrae. During parturition the perineum may be torn, resulting in possible damage to the urinary meatus and anal sphincter. To avoid a perineal laceration the veterinarian may cut the perineum just before delivery and suture the incision after delivery. See also episiotomy, perineorrhaphy.

Wikipedia: Perineum
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Perineum
Gray406.png
The muscles of the male perineum
Gray's subject #120 424
Artery perineal artery, dorsal artery of the penis, deep artery of the penis
Nerve perineal nerve, posterior scrotal nerves, dorsal nerve of the penis, dorsal nerve of clitoris
Lymph primarily superficial inguinal lymph nodes

In human anatomy, the perineum is generally defined as the surface region in both males and females between the pubic symphysis and the coccyx. The perineum is the region of the body inferior to the pelvic diaphragm and between the legs. It is a diamond-shaped area on the inferior surface of the trunk which includes the anus and, in females, the vagina.[1] Its definition varies: it can refer to only the superficial structures in this region, or it can be used to include both superficial and deep structures.

The perineum corresponds to the outlet of the pelvis.

The anogenital distance is a measure of the distance between the anus and the base of the penis. Studies show that the perineum is twice as long in males as in females.[2] Measuring the anogenital distance in neonatal humans has been suggested as a noninvasive method to determine male feminisation and thereby predict neonatal and adult reproductive disorders.[3]

Perineum of a man
Perineum of a woman

Contents

Boundaries

Its deep boundaries are as follows:[4]

In Alfred Kinsey's 1967 report, he concluded that the perineum was one of the 6 key erogenous zones for males.

Triangles

A line drawn transversely across in front of the ischial tuberosities divides the space into two triangles:

Name Location Contents
Urogenital triangle the anterior triangle in females, contains the vagina
Anal triangle the posterior triangle contains the anus

Perineal fascia

The terminology of the perineal fascia can be confusing, and there is some controversy over the nomenclature. This stems from the fact that there are two parts to the fascia, the superficial and deep parts, and each of these can be subdivided into superficial and deep parts.

The layers and contents are as follows, from superficial to deep:

  • 2) superficial perineal fascia: Subcutaneous tissue divided into two layers: (a) A superficial fatty layer, and (b) Colles' fascia, a deeper, membranous layer.
  • 3) deep perineal fascia and muscles:
superficial perineal pouch Contains superficial perineal muscles: transversus perinei superficialis, bulbospongiosus, ischiocavernosus
inferior fascia of urogenital diaphragm, or perineal membrane A membranous layer of the deep fascia.
deep perineal pouch Contains the deep perineal muscles: transversus perinei profundus, sphincter urethrae membranaceae
superior fascia of the urogenital diaphragm Considered hypothetical by some modern anatomists, but still commonly used to logically divide the contents of the region.

Areas of the perineum

The region of the perineum can be considered a distinct area from pelvic cavity, with the two regions separated by the pelvic diaphragm. The following areas are thus classified as parts of the perineal region:

In popular culture

  • A colloquial term for the perineum is the "taint", because "it ain't your (balls or pussy), and it ain't your asshole", meaning, "it isn't the genitals, and it isn't the anus".[5][6]
  • It is possible to pierce the perineum with what is called a guiche piercing; another colloquial term for the perineum is the guiche.[7]

Images

See also

References

  1. ^ Gray, Henry. Anatomy of the Human Body. Philadelphia: Lea & Febiger, 1918; Bartleby.com, 2000.
  2. ^ Validity of anogenital distance as a marker of in utero phthalate exposure. PMID 16393642
  3. ^ Michelle Welsh, et al.: Identification in rats of a programming window for reproductive tract masculinization, disruption of which leads to hypospadias and cryptorchidism. J. Clin. Invest., 13 March 2008.
  4. ^ perineumboundaries
  5. ^ Taint, at the Online Slang Dictionary
  6. ^ Great Sex for Moms: Ten Steps to Nurturing Passion While Raising Kids By M D Valerie Davis Raskin, pgs 160–162, Simon and Schuster, 2002; ISBN 0743242890, 9780743242899
  7. ^ Piercing Bible: The Definitive Guide to Safe Body Piercing Elayne Angel, pg165–166, The Crossing Press, 2009; ISBN 1580911935, 9781580911931.

External links


Translations: Perineum
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Dansk (Danish)
n. - mellemkød

Nederlands (Dutch)
gebied tussen anus en externe geslachtsdelen, perineum

Français (French)
n. - périnée

Deutsch (German)
n. - Damm

Ελληνική (Greek)
n. - περίνεο

Italiano (Italian)
perineo

Português (Portuguese)
n. - períneo (m) (Anat.)

Русский (Russian)
промежность

Español (Spanish)
n. - perineo

Svenska (Swedish)
n. - bäckenbotten

中文(简体)(Chinese (Simplified))
会阴

中文(繁體)(Chinese (Traditional))
n. - 會陰

한국어 (Korean)
n. - 회음(부)

日本語 (Japanese)
n. - 会陰

العربيه (Arabic)
‏(الاسم) شرج, عجان : المنطقه بين فتحه التناسل والشرج‏

עברית (Hebrew)
n. - ‮חיץ הנקביים (המרווח בין פי-הטבעת ואברי המין)‬


 
 

 

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
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World of the Body. The Oxford Companion to the Body. Copyright © 2001, 2003 by Oxford University Press. All rights reserved.  Read more
Dental Dictionary. Mosby's Dental Dictionary. Copyright © 2004 by Elsevier, Inc. All rights reserved.  Read more
Sports Science and Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved.  Read more
Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Perineum" Read more
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