Vulval vestibule | |
---|---|
Details | |
Precursor | Urogenital sinus |
Part of | Vulva |
System | Reproductive system |
Identifiers | |
Latin | vestibulum vaginae |
TA98 | A09.2.01.011 |
TA2 | 3558 |
FMA | 19970 |
Anatomical terminology |
The vulval vestibule (also known as the vulvar vestibule or vestibule of vagina) is the part of the vulva between the labia minora. On the inside, the urinary meatus and the vaginal introitus open to the vestibule, while the outer edge is marked by Hart's line, named after David Berry Hart.
It represents the distal end of the urogenital sinus of the embryo. [1]
Structures opening in the vulval vestibule are the urethra, vagina, Bartholin's glands, and Skene's glands. [1]
The external urethral orifice is placed about 25–30 millimetres (1–1.2 in) [2] behind the clitoris and immediately in front of that of the vagina; it usually assumes the form of a short, sagittal cleft with slightly raised margins. Nearby are the openings of the Skene's ducts.
The vaginal orifice is a median slit below and behind the opening of the urethra; its size varies inversely with that of the hymen.
To the left and right of the vulval vestibule are the labia minora. Anterior to it are the clitoral hood, frenulum clitoridis, and the clitoral glans. Posterior to it is the posterior commissure of the labia minora and the frenulum of labia minora.
The sides of the vestibule are visible as Hart's line on the inside of the inner lips. Hart's line is the outer edge of the area and marks the change from vulvar skin to the smoother transitional skin of the vulva.
Except for primates (including humans) and some rodents, the equivalent of the vulval vestibule in many other female mammals is called the urogenital sinus, [3] the same term used to refer to the body part of the mammalian embryo that has separated from the anal canal.
The prevalence of pain at the vulvar vestibule is relatively common. A study by the University of Michigan found that about 28% of women have experienced vulvar vestibular pain in the past, and about 8% had the pain in the last six months. [4]
In amniotes, the clitoris is a female sex organ. In humans, it is the vulva's most erogenous area and generally the primary anatomical source of female sexual pleasure. The clitoris is a complex structure, and its size and sensitivity can vary. The visible portion, the glans, of the clitoris is typically roughly the size and shape of a pea and is estimated to have at least 8,000 nerve endings.
In primates, and specifically in humans, the labia majora, also known as the outer lips or outer labia, are two prominent longitudinal skin folds that extend downward and backward from the mons pubis to the perineum. Together with the labia minora, they form the labia of the vulva.
The labia minora, also known as the inner labia, inner lips, or nymphae, are two flaps of skin that are part of the primate vulva, extending outwards from the vaginal and urethral openings to encompass the vestibule. The labia minora are situated between the labia majora and together form the labia. They vary widely in size, color and shape from individual to individual.
In female human anatomy, Skene's glands or the Skene glands are glands located around the lower end of the urethral meatus. The glands are surrounded by tissue that swells with blood during sexual arousal, and secrete a fluid from openings near the urethra, particularly during orgasm.
The Bartholin's glands are two pea-sized compound alveolar glands located slightly posterior and to the left and right of the opening of the vagina. They secrete mucus to lubricate the vagina.
The urogenital sinus is a part of the human body only present in the development of the urinary and reproductive organs. It is the ventral part of the cloaca, formed after the cloaca separates from the anal canal during the fourth to seventh weeks of development.
The female reproductive system is made up of the internal and external sex organs that function in the reproduction of new offspring. The human female reproductive system is immature at birth and develops to maturity at puberty to be able to produce gametes, and to carry a fetus to full term. The internal sex organs are the vagina, uterus, fallopian tubes, and ovaries. The female reproductive tract includes the vagina, uterus, and fallopian tubes and is prone to infections. The vagina allows for sexual intercourse and childbirth, and is connected to the uterus at the cervix. The uterus or womb accommodates the embryo, which develops into the fetus. The uterus also produces secretions, which help the transit of sperm to the fallopian tubes, where sperm fertilize ova produced by the ovaries. The external sex organs are also known as the genitals and these are the organs of the vulva including the labia, clitoris, and vaginal opening.
The development of the urinary system begins during prenatal development, and relates to the development of the urogenital system – both the organs of the urinary system and the sex organs of the reproductive system. The development continues as a part of sexual differentiation.
The labia are the major externally visible portions of the vulva. In humans and other primates, there are two pairs of labia: the labia majora are large and thick folds of skin that cover the vulva's other parts while the labia minora are the inner folds of skin between the outer labia that surround and protect the urethral and vaginal openings.
Fingering is sexual stimulation of the vulva or vagina by using the fingers. Vaginal fingering is legally and medically called digital penetration or digital penetration of the vagina. The term "digital" takes its significance from the English word 'digit', which refers to a finger, thumb, or toe. Fingering may also include the use of fingers to stimulate the anus.
Labiaplasty is a plastic surgery procedure for creating or altering the labia minora and the labia majora, the folds of skin of the human vulva. It is a type of vulvoplasty. There are two main categories of women seeking cosmetic genital surgery: those with conditions such as intersex, and those with no underlying condition who experience physical discomfort or wish to alter the appearance of their vulvas because they believe they do not fall within a normal range.
Vulvar cancer is a cancer of the vulva, the outer portion of the female genitals. It most commonly affects the labia majora. Less often, the labia minora, clitoris, or Bartholin's glands are affected. Symptoms include a lump, itchiness, changes in the skin, or bleeding from the vulva.
The urinary meatus, also known as the external urethral orifice, is the opening where urine exits the male and female urethra. It is where semen also exits the male urethra. The meatus has varying degrees of sensitivity to touch.
The development of the reproductive system is the part of embryonic growth that results in the sex organs and contributes to sexual differentiation. Due to its large overlap with development of the urinary system, the two systems are typically described together as the genitourinary system.
In mammals, the vulva consists of the external female genitalia. The human vulva includes the mons pubis, labia majora, labia minora, clitoris, vulval vestibule, urinary meatus, vaginal opening, hymen, and Bartholin's and Skene's vestibular glands. The vulva includes the entrance to the vagina, which leads to the uterus, and provides a double layer of protection for this by the folds of the outer and inner labia. Pelvic floor muscles support the structures of the vulva. Other muscles of the urogenital triangle also give support.
Labial fusion is a medical condition of the vulva where the labia minora become fused together. It is generally a pediatric condition.
A vulvar disease is a particular abnormal, pathological condition that affects part or all of the vulva. Several pathologies are defined. Some can be prevented by vulvovaginal health maintenance.
A rectovestibular fistula, also referred to simply as a vestibular fistula, is an anorectal congenital disorder where an abnormal connection (fistula) exists between the rectum and the vulval vestibule of the female genitalia.
A vestibulectomy is a gynecological surgical procedure that can be used to treat vulvar pain, specifically in cases of provoked vestibulodynia. Vestibulodynia is a chronic pain syndrome that is a subtype of localized vulvodynia where chronic pain and irritation is present in the vulval vestibule, which is near the entrance of the vagina. Vestibulectomy may be partial or complete.
This article incorporates text in the public domain from page 1264 of the 20th edition of Gray's Anatomy (1918)