Embryology · Urogenital system
Genital ducts: Wolffian (mesonephric) and Müllerian (paramesonephric) !
- Embryonic structure
Every embryo has two pairs of genital ducts; males keep one pair, females the other, and the lost pair leaves small remnants.
Updated 2026-11-01
See it in 3D: Uterine tubes · Body of uterus · Cervix · Vagina · Ductus deferens · Epididymis · Seminal vesicles
What it is
By week 6 every embryo has two pairs of ducts: the mesonephric (Wolffian) and the paramesonephric (Müllerian). Testosterone keeps the Wolffian ducts and anti-Müllerian hormone erases the Müllerian ones; without those hormones the opposite happens. Knowing what each duct gives, and what remnant it leaves, explains Gartner cysts, the appendix testis and uterine malformations.
Key facts
- Week 6: the Müllerian ducts appear as an infolding of coelomic epithelium, lateral to the Wolffian ducts.
- Weeks 8–10: AMH makes the Müllerian ducts regress in males.
- The cranial mesonephric tubules form the efferent ductules of the testis.
- The Müllerian ducts need the Wolffian duct as a guide to elongate.
- HOXA10 (uterus) and HOXA13 (cervix and vagina) give each segment its identity.
Structure
- Mesonephric (Wolffian) duct: arises from the mesonephros and opens into the cloaca.
- Paramesonephric (Müllerian) duct: a cranial part open to the coelom (future infundibulum), a horizontal part that crosses the Wolffian duct and a caudal part that fuses in the midline.
- Sinusal (Müllerian) tubercle: where the fused ducts touch the urogenital sinus.
What it becomes
- Male: epididymis, ductus deferens, seminal vesicle, ejaculatory duct and efferent ductules.
- Female: uterine tubes, uterus, cervix and upper third of the vagina.
- Both sexes: ureter, renal pelvis and collecting ducts (ureteric bud of the Wolffian duct) and the bladder trigone.
Embryonic duct or tubule → male derivative → female derivative (remnants in brackets)
| Primordium | Male | Female |
|---|---|---|
| Mesonephric (Wolffian) duct | Epididymis, ductus deferens, seminal vesicle, ejaculatory duct | (Gartner duct or cyst) |
| Cranial mesonephric tubules | Efferent ductules | (Epoophoron) |
| Caudal mesonephric tubules | (Paradidymis) | (Paroophoron) |
| Paramesonephric (Müllerian) duct | (Appendix testis) | Tubes, uterus, cervix, upper vagina |
| Fused caudal Müllerian ducts | (Prostatic utricle) | Uterus and cervix |
| Ureteric bud (from Wolffian duct) | Ureter, pelvis, calyces, collecting ducts | Ureter, pelvis, calyces, collecting ducts |
Markers
- AMH
- WNT4
- HOXA10
- HOXA13
Clinical notes
- Failure of Müllerian fusion or septal resorption: uterus didelphys, bicornuate or septate uterus.
- Müllerian agenesis (Mayer-Rokitansky-Küster-Hauser syndrome): no uterus or upper vagina, normal ovaries.
- Gartner duct cyst: a cyst in the lateral vaginal wall.
- Torsion of the appendix testis: acute scrotal pain in boys, sometimes with the “blue dot sign”.
- Congenital absence of the ductus deferens: common in cystic fibrosis (CFTR).
Test yourself
Think of the answer, then tap the question to see it.
Which embryonic duct forms the uterus and uterine tubes?
The paramesonephric (Müllerian) duct; its fused caudal ends form the uterus and cervix.
What remnant does the Wolffian duct leave in females, and where?
The Gartner duct, which can form a cyst in the lateral vaginal wall; the epoophoron and paroophoron also remain in the mesosalpinx.
Why do Müllerian anomalies go with kidney anomalies?
The ureteric bud arises from the Wolffian duct, and the Müllerian ducts need the Wolffian duct as a guide; one shared failure affects both.
Which male structure next to the testis is a Müllerian remnant?
The appendix testis, at its upper pole; the prostatic utricle is the caudal remnant.
See it in 3D
The structures of Durgical's 3D anatomy where it is found.
Related
- Sex determination: SRY, anti-Müllerian hormone and testosterone
- Gonads and the descent of the testis
- Kidney: pronephros, mesonephros, metanephros and ascent
- Uterine anomalies: bicornuate, septate, didelphys, Müllerian agenesis
- Differences of sex development: CAH, AIS and 5α-reductase
- Androgens, diethylstilbestrol and other hormones
- External genitalia and their male–female homologues
Educational content on embryonic development; not a guide to prenatal diagnosis or to medicines in pregnancy and no substitute for a health professional's advice. No doses are given.
Sources: Embryology, Sexual Development - StatPearls - NCBI Bookshelf (StatPearls Publishing (NCBI Bookshelf), 2023); Embryology, Genitourinary - StatPearls - NCBI Bookshelf (StatPearls Publishing (NCBI Bookshelf), 2023).
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Representative model, for educational purposes only.