|Embryology - 19 Jan 2021 Expand to Translate|
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The embryonic origin of the vagina has been a historically hotly debated issue with several different contributions and origins described. Current molecular studies show the whole vagina epithelium is derived from the paramesonephric (Müllerian) duct with bone morphogenic protein 4 (BMP4) reshaping the intermediate mesoderm-derived Müllerian duct into the vaginal primordium. Transgenic studies in mice also identified the developmental origin of vaginal epithelium derived solely from Müllerian duct epithelium. Vaginal development is also under negative control of androgens.
See also for external genitalia Integumentary System Development.
Acién's hypothesis, related to abnormalities and the embryology of the human vagina as deriving from the Wolffian ducts and the Müllerian tubercle.
Koff (1933) coined the terms "sinovaginal bulb" and "vaginal plate" and proposed that the upper 80% of the vagina is derived from Müllerian epithelium and the lower 20% derived from urogenital sinus epithelium,
Bulmer (1957) proposed that vaginal epithelium derives solely from urogenital sinus epithelium.
Robboy etal., (2017) using Carnegie Collection embryos and immunostained for PAX2 (Müllerian epithelium) and FOXA1 (urogenital sinus epithelium). Their results support Bulmer's proposal that human vaginal epithelium derives solely from urogenital sinus epithelium and is different from mouse vaginal development.
Some Recent Findings
|More recent papers|
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
The paired paramesonephic ducts (Müllerian ducts) go through a series of developmental changes recently identified as regulated by a number of molecular factors.
|Female Uterus and Vagina (between week 9 and 20)|
|The entire vagina is formed from the paramesonephric (Müllerian) duct (red) and does not have a contribution from the urogenital endoderm (yellow).|
- Links: BMP4
|Processes regulated by Wnt4 during female reproductive tract development
Wnt4 is required during prenatal and postnatal development of female reproductive tract.
The initial MD primordium occurs independently of Wnt4 function (E11.5, the MD primordium in red).
After initiation of the process, differentiation of the MD tip cells, prenatal elongation of the MD and postnatal formation of the endometrial gland (eG) all depend on Wnt4 signalling.
The daughter cells that are initially Wnt4+ contribute to MD and eG formation. (text from figure legend)
Female reproductive tract Wnt4
- Links: WNT
In mice, the epithelial fate of female reproductive organs is determined by factors secreted from the stroma. Retinoic acid-Retinoic acid Receptor signaling in the Müllerian duct determines the fate of stroma to form the future uterus and vagina.
Coelomic epithelium Lim1 expressing cells are specified to a duct fate.
- Lim - proteins named for 'LIN11, ISL1, and MEC3,' are defined by the possession of a highly conserved double zinc finger motif called the LIM domain.
- LIM domain-binding factors - interact with the LIM domains of nuclear proteins are capable of binding to a variety of transcription factors.
Duct invagination induced by Wnt4 to reach the mesonephric (Wolffian)
Cells at the leading tip proliferate and form the duct elongating to reach the cloaca (urogenital sinus). Mesonephric secretes WNT9b to guide duct elongation. Pax2 also acts in elongation and duct maintenance.
- WNT9b - member of the WNT protein family that encode cysteine-rich secreted glycoproteins that act as extracellular signaling factors.
- Pax2 - member of the paired box protein family.
The following result come from a recent human developmental study of known epithelial and mesenchymal markers. Note that KRT is keratin protein family with the number representing a specific isoform.
- KRT7, KRT8 and KRT19 - expressed in undifferentiated Müllerian duct and uterovaginal canal, lined by simple columnar epithelia. Later glandular uterine tube, uterine corpus, and endocervix continue expression of these keratins.
- TP63 and RUNX1 - expressed prior to KRT14 in developing Müllerian epithelium.
- KRT6, KRT14 and KRT10 - expressed in exocervix and vagina tissues that undergo stratified squamous differentiation during development in an age-dependent fashion.
- KRT10 - expressed in the vagina after endogenous estrogens transformed the epithelium to a thick glycogenated squamous epithelium. KRT10 is a marker of epithelial terminal differentiation.
- Uroplakin - expressed only in vaginal introitus (entrance), bladder and urethra.
- HOXA11 - expressed in uterine mesenchyme.
- ISL1 - expressed in vaginal mesenchyme.
A study in mouse has identified Dicer, a riboendonuclease required for microRNA biosynthesis, to be required for postnatal growth if the female reproductive tract.
A recent study using magnetic resonance imaging (MRI) has accurately measured the dimensions of the adult vagina.
- "Seventy-seven MRI scans were performed on 28 women before gel application to establish baseline vaginal measurements. Average dimensions were calculated for each woman and for the population. The influence of potential covariates (age, height, weight and parity) on these dimensions was assessed. ...Mean vaginal length from cervix to introitus was 62.7 mm. Vaginal width was largest in the proximal vagina (32.5 mm), decreased as it passed through the pelvic diaphragm (27.8 mm) and smallest at the introitus (26.2 mm)."
Female cetaceans (whales, dolphins, and porpoises) and hippopotamuses have unusual vaginal folds of tissue that are of unknown function(s).
Female waterfowl have vaginal morphology involving complex convolutions and also a number of dead-end sacs.
In addition to the genetic abnormalities described below, abnormal sex hormone levels (estrogens, progestins and androgens) have been shown to be teratogenic for female reproductive tract development. See also endocrine disruptors.
Mayer- Rokitansky-Kuster-Hauser syndrome
(MRKH) Abnormality of development of the female genital tract: partial or complete absence (agenesis) of the uterus; absent or hypoplastic vagina; normal fallopian tubes, ovaries, normal external genitalia and normal female chromosome pattern (46, XX). Has an incidence of approximately 1 in 4500 newborn girls and has been associated with a microdeletion at 17q12.
ACOG Committee Opinion No. 728 Summary: Müllerian Agenesis: Diagnosis, Management, And Treatment
- "Müllerian agenesis, also referred to as müllerian aplasia, Mayer-Rokitansky-Küster-Hauser syndrome, or vaginal agenesis, has an incidence of 1 per 4,500-5,000 females. Müllerian agenesis is caused by embryologic underdevelopment of the müllerian duct, with resultant agenesis or atresia of the vagina, uterus, or both. Patients with müllerian agenesis usually are identified when they are evaluated for primary amenorrhea with otherwise typical growth and pubertal development. The most important steps in the effective management of müllerian agenesis are correct diagnosis of the underlying condition, evaluation for associated congenital anomalies, and psychosocial counseling in addition to treatment or intervention to address the functional effects of genital anomalies. The psychologic effect of the diagnosis of müllerian agenesis should not be underestimated. All patients with müllerian agenesis should be offered counseling and encouraged to connect with peer support groups. Future options for having children should be addressed with patients: options include adoption and gestational surrogacy. Assisted reproductive techniques with use of a gestational carrier (surrogate) have been shown to be successful for women with müllerian agenesis. Nonsurgical vaginal elongation by dilation should be the first-line approach. When well-counseled and emotionally prepared, almost all patients (90-96%) will be able to achieve anatomic and functional success by primary vaginal dilation. In cases in which surgical intervention is required, referrals to centers with expertise in this area should be considered because few surgeons have extensive experience in construction of the neovagina and surgery by a trained surgeon offers the best opportunity for a successful result."
Obstructed HemiVagina and Ipsilateral Renal Anomaly with uterine didelphysis is a syndrome due to lateral non-fusion of the Mullerian ducts with asymmetric obstruction. The presence of vaginal septum also gives rise to other clinical conditions.
OHVIRA Syndrome Magnetic Resonance Images
Endocrine disruptors in female reproductive tract development and carcinogenesis.
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Cite this page: Hill, M.A. (2021, January 19) Embryology Vagina Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Vagina_Development
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