Hymen

Source: Wikipedia, the free encyclopedia.
This article is about the vaginal membrane. For the village, see Heyman, Iran. For other uses, see Hymen (disambiguation).

Hymen
Various types of hymens (the shaded areas represent the vaginal opening)
External genitals of a human female
Details
Identifiers
Latinhymen
MeSHD006924
TA98A09.1.04.008
TA23530
FMA20005
Anatomical terminology

The hymen is a thin piece of

vaginal opening. A small percentage are born with hymens that are imperforate and completely obstruct the vaginal canal. It forms part of the vulva and is similar in structure to the vagina.[1][2]
The term comes straight from the Greek, for 'membrane'.

In children, a common appearance of the hymen is crescent-shaped, although many shapes are possible. Each shape in the natural range has a Latinate name. During puberty, estrogen causes the hymen to change in appearance and become very elastic.[3][4] Normal variations of the post-pubertal hymen range from thin and stretchy to thick and somewhat rigid.[1] Very rarely, it may be completely absent.[5]

The hymen can rip or tear during first

hymen reconstruction surgery
to give the appearance of virginity.

Development and histology

The

Müllerian ducts move downwards to reach the urogenital sinus, forming the uterovaginal canal and inserting into the urogenital sinus. At week twelve, the Müllerian ducts fuse to create a primitive uterovaginal canal called unaleria. At month five, the vaginal canalization is complete and the fetal hymen is formed from the proliferation of the sinovaginal bulbs (where Müllerian ducts meet the urogenital sinus), and normally becomes perforate before or shortly after birth.[11]

The hymen has dense innervation. In newborn babies, still under the influence of the mother's

hormones, the hymen is thick, pale pink, and redundant (folds in on itself and may protrude). For the first two to four years of life, the infant produces hormones that continue this effect.[12] Their hymenal opening tends to be annular (circumferential).[13]

Post

neonatal stage, the diameter of the hymenal opening (measured within the hymenal ring) widens by approximately 1 mm for each year of age.[14] During puberty, estrogen causes the hymen to become very elastic and fimbriated.[3][4]

  • Arrows point to carunculae myrtiformes ("remnants") of the hymen in a post-pubertal individual.
    Arrows point to carunculae myrtiformes ("remnants") of the hymen in a post-pubertal individual.

The hymen can stretch or tear as a result of various behaviors, by the use of

speculum, sexual intercourse,[1] insertion of multiple fingers or items into the vagina, and activities such as gymnastics (doing 'the splits'), horseback riding or trauma caused by a "straddle injury".[15] Remnants of the hymen are called carunculae myrtiformes.[10]

A glass or plastic rod of 6 mm diameter having a globe on one end with varying diameter from 10 to 25 mm, called a Glaister Keen rod, is used for close examination of the hymen or the degree of its rupture. In

prepubescent girl avoid the hymen and swab the outer vulval vestibule instead.[12] In cases of suspected rape or child sexual abuse, a detailed examination of the hymen may be performed, but the condition of the hymen alone is often inconclusive.[2]

Anatomic variations

Normal variations of the hymen range from thin and stretchy to thick and somewhat rigid.[1][12] An imperforate hymen occurs in 1-2 out of 1,000 infants.[16][17] The only variation that may require medical intervention is the imperforate hymen, which either completely prevents the passage of menstrual fluid or slows it significantly. In either case, surgical intervention may be needed to allow menstrual fluid to pass or intercourse to take place at all.[18]

Prepubescent hymenal openings come in many shapes, depending on hormonal and activity level, the most common being crescentic (posterior rim): no tissue at the 12 o'clock position; crescent-shaped band of tissue from 1–2 to 10–11 o'clock, at its widest around 6 o'clock. From puberty onwards, depending on estrogen and activity levels, the hymenal tissue may be thicker, and the opening is often fimbriated or erratically shaped.[13] In younger children, a torn hymen will typically heal very quickly. In adolescents, the hymenal opening can naturally extend and variation in shape and appearance increases.[1]

Variations of the female reproductive tract can result from agenesis or hypoplasia, canalization defects, lateral fusion and failure of resorption, resulting in various complications.[19]

  • Imperforate: hymenal opening nonexistent; will require minor surgery if it has not corrected itself by puberty to allow menstrual fluids to escape.[20]
  • Cribriform, or microperforate: sometimes confused for imperforate, the hymenal opening appears to be nonexistent, but has, under close examination, small perforations.[21]
  • Septate: the hymenal opening has one or more bands of tissue extending across the opening.[22]

Trauma

A hymen with a hymenal cleft visible on the left.

Historically, it was believed that first sexual intercourse was necessarily traumatic to the hymen and always resulted in the hymen being "broken" or torn, causing bleeding. However, research on women in Western populations has found that bleeding during first intercourse does not invariably occur.[8][9][23] In one cross-cultural study, slightly more than half of all women self-reported bleeding during first intercourse, with significantly different levels of pain and bleeding reported depending on their region of origin.[24][23] Not all women experience pain, and one study found a correlation between the experience of strong emotions – such as excitement, nervousness, or fear – with experiencing pain during first intercourse.[25]

In several studies of adolescent female rape victims, where patients were examined at a hospital following sexual assault, half or fewer of virgin victims had any injury to the hymen.[26][27][28] Tears of the hymen occurred in less than a quarter of cases.[28] However, virgins were significantly more likely to have injuries to the hymen than non-virgins.[26][28]

In a study of adolescents who had previously had consensual sex, approximately half showed evidence of trauma to the hymen.[29][30] Trauma to the hymen may also occur in adult non-virgins following consensual sex, although it is rare.[31] Trauma to the hymen may heal without any visible sign of injury.[26][30][1] An observational study of adolescent sexual assault victims found that majority of wounds to the hymen healed without any visible sign of injury having occurred.[32]

Trauma to the hymen is hypothesized to occur as a result of various other behaviors, such as

speculum, masturbation, gymnastics, or horseback riding, although the true prevalence of trauma as a result of these activities is unclear.[7][33][34]

Cultural and religious significance

Further information: Virginity test

The hymen is often attributed important cultural significance in certain communities because of its association with a woman's virginity. In those cultures, an intact hymen is highly valued at marriage in the belief that this is a proof of virginity.[7][35][36] Some women undergo hymenorrhaphy to restore their hymen for this reason.[36] In October 2018, the UN Human Rights Council, UN Women and the World Health Organization (WHO) stated that virginity testing must end as "it is a painful, humiliating and traumatic practice, constituting violence against women".[37]

According to traditional Christian theological interpretations, "It is intended by God for the husband to be the one to break his wife's hymen", which when perforated during intercourse creates a blood covenant that seals the bond of holy matrimony between husband and wife (cf. consummation).[38]

Womb fury

In the 16th and 17th centuries, medical researchers mistakenly saw the presence or absence of the hymen as founding evidence of physical diseases such as "womb-fury", i.e., (female) hysteria. If not cured, womb-fury would, according to doctors practicing at the time, result in death.[39][40]

Other animals

Due to similar reproductive system development, many mammals have hymens, including chimpanzees, elephants, manatees, whales, horses and llamas.[41][42]

See also

References

  1. ^
    ISBN 978-0-19-507425-3. Archived from the original
    (PDF) on July 8, 2018. Retrieved July 8, 2018.
  2. ^
    ISBN 978-1-84214-199-1
    .
  3. ^
    PMID 11261865
    .
  4. ^
    ISBN 978-0-19-507425-3. Archived from the original
    (PDF) on July 8, 2018. Retrieved July 8, 2018.
  5. PMID 31159818
    .
  6. ISSN 2219-8083
    . Possible explanations for the lack of genital trauma include... acute injuries occur but heal completely.
  7. ^ a b c d "The Hymen". University of California, Santa Barbara. Retrieved September 19, 2020. While some females bleed the first time they have penetrative intercourse, not every female does. This depends on many factors, such as how much hymenal tissue a female has, whether her hymen has already been stretched or torn, or how thick and elastic it is.
  8. ^
    PMID 9694770
    .
  9. ^
    PMID 10037658
    . We agree with Rogers and Stark that so called rupture and bleeding of the hymen is not to be routinely expected after first sexual intercourse.
  10. ^
    ISBN 978-0-7131-4452-9
    .
  11. ISBN 978-3-540-85602-3
    .
  12. ^
    ISBN 978-1-84-110026-5
  13. ^
    ISBN 978-0-19-507425-3
    .
  14. CiteSeerX 10.1.1.522.1894
    .
  15. ^ "Bodies without evidence". The Sydney Morning Herald. September 21, 2002. Retrieved July 13, 2021.
  16. ISBN 978-0-7817-8249-4
    .
  17. PMID 21686660
    .
  18. ^ "Imperforate hymen". medlineplus.gov. United States National Library of Medicine. 2021.
  19. ^ "Congenital Anomalies of the Hymen". brighamandwomens.org. Brigham and Women's Hospital.
  20. ^ "Imperforate Hymen". mountsinai.org. Mount Sinai Hospital (Brooklyn).
  21. ^ "Cribriform Hymen". texaschildrens.org. Texas Children's Hospital.
  22. ^ "Septate Hymen". childrenshospital.org. Boston Children's Hospital.
  23. ^ a b Loeber, Olga (2008). "Over het zwaard en de schede; bloedverlies en pijn bij de eerste coïtus Een onderzoek bij vrouwen uit diverse culturen" (PDF). Tijdschrift voor Seksuologie (in Dutch). Vol. 32. pp. 129–137. Retrieved September 7, 2018.
  24. S2CID 37484764
    .
  25. S2CID 6427129
    .
  26. ^
    PMID 16564196
    . Hymen injury was noted in 40 (50.6%) participants of the virgin group, but only 11 (12.4%) of the non-virgin group
  27. PMID 10869972
    .
  28. ^
    PMID 11748013
    . The incidence of hymenal tears in self-described virgins was higher than in nonvirgins (19% vs. 3%, P .008);
  29. PMID 14993089
    . Subjects who admitted having past intercourse still had non disrupted, intact hymens in 52% of cases.
  30. ^ a b "New York Times Is Wrong about Hymens--But They Are Not Alone". Psychology Today. Retrieved September 8, 2018.
  31. PMID 9077615
    .
  32. ISSN 0305-1862
    . Of the girls who sustained 'superficial', 'intermediate,' or 'deep' lacerations, 15 of 18 prepubertal girls had smooth and continuous appearing hymenal rims, whereas 24 of 41 adolescents' hymens had a normal, 'scalloped' appearance and 30 of 34 had no disruption of continuity on healing. The final 'width' of a hymenal rim was dependent on the initial depth of the laceration. No scar tissue formation was observed in either group of girls.
  33. PMID 9670493
    .
  34. PMID 8021768
    . Contrary to the popular belief that transections of the hymen are associated with gymnastics, horseback riding, and other vigorous sports, we found no relation between sports or gymnastics and hymenal changes. There was also no relation to prior gynecologic examination.
  35. ^ "Muslim women in France regain virginity in clinics". Reuters. April 30, 2007. 'Many of my patients are caught between two worlds,' said Abecassis. They have had sex already but are expected to be virgins at marriage according to a custom that he called 'cultural and traditional, with enormous family pressure'.
  36. ^ a b Sciolino, Elaine; Mekhennet, Souad (June 11, 2008). "In Europe, Debate Over Islam and Virginity". The New York Times. Retrieved June 13, 2008. 'In my culture, not to be a virgin is to be dirt,' said the student, perched on a hospital bed as she awaited surgery on Thursday. 'Right now, virginity is more important to me than life.'
  37. ^ "United Nations agencies call for ban on virginity testing". World Health Organization. October 17, 2018. Retrieved October 22, 2018.
  38. ISBN 978-1-6642-1232-9
    .
  39. S2CID 148179899
    .
  40. ^ The linkage between the hymen and social elements of control has been taken up in Marie Loughlin's book Hymeneutics: Interpreting Virginity on the Early Modern Stage published in 1997
  41. ISBN 978-1-59691-010-2
    . Retrieved November 9, 2013.
  42. ISBN 978-0-8135-3455-8
    . Hymens, or vaginal closure membranes or vaginal constrictions, as they are often referred to, are found in a number of mammals, including llamas, ...

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