Development of uterus diagrams

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Development of the Uterus

1. Embryological Origin

The uterus develops from the paramesonephric (Müllerian) ducts - a pair of longitudinal tubes arising from the coelomic epithelium lateral to the mesonephros, appearing around weeks 5-6 of embryonic development.

In the female embryo, the absence of anti-Müllerian hormone (AMH/MIS) - which would otherwise cause Müllerian duct regression - allows the paramesonephric ducts to persist and develop. This occurs in the presence of estrogen and the absence of testosterone.

2. Three-Part Structure of Each Paramesonephric Duct

Each paramesonephric duct has three recognizable segments:

Cranial vertical portion - opens into the abdominal cavity → becomes the uterine (fallopian) tube
Horizontal part - crosses the mesonephric duct
Caudal vertical part - fuses with its partner from the opposite side → forms the uterine canal

3. Diagram A: Early Development - Müllerian and Mesonephric Ducts

This diagram shows the early fetal female reproductive system, with the Müllerian duct (pink/red) running alongside the mesonephros (blue), both converging at the urogenital sinus to form the Müllerian tubercle (the precursor to the uterovaginal canal).

Early female genital development: Müllerian duct, mesonephros, and urogenital sinus

Fig. 22.1A - Robbins & Kumar Pathologic Basis of Disease: Early development showing mesonephric (blue) and Müllerian (red) ducts merging at the urogenital sinus.

4. Diagram B: Transverse Sections Showing Duct Fusion

Three cross-sectional stages show how the paramesonephric ducts approach each other from the lateral urogenital ridges, fuse in the midline, and form the broad ligament of the uterus as a transverse pelvic fold. The gonads (ovaries) come to rest at the posterior surface of this fold.

Transverse sections showing paramesonephric duct fusion forming the uterus and broad ligament

Fig. 16.27 - Langman's Medical Embryology: (A) Urogenital ridges separate; (B) Paramesonephric ducts approach midline with ovary visible; (C) Fused paramesonephric ducts form the uterus, with broad ligament, uterovesical pouch, and uterorectal pouch established.

5. Diagram C: Vagina and Uterus Formation from Sinovaginal Bulbs

This diagram shows the sequential canalization of the fused paramesonephric ducts and the contribution of the sinovaginal bulbs (from the urogenital sinus) to vaginal formation.

Formation of the vagina and uterus from sinovaginal bulbs and paramesonephric ducts

Fig. 47.1 - Campbell Walsh Wein Urology: (A) Uterine septum still present, sinovaginal bulb tissue (vaginal plate) below; (B) Canalization progressing, uterine lumen opening; (C) Fully formed uterus with cervix, fornix, vagina, and hymen.

6. Diagram D: Male vs. Female Gonad and Genital Development (Comparative)

This side-by-side comparison shows how identical indifferent structures differentiate under hormonal control:

In males: SRY protein → Sertoli cells → AMH causes Müllerian regression; mesonephric ducts persist
In females: No SRY/AMH → paramesonephric ducts develop into fallopian tubes, uterus, and upper vagina; mesonephric ducts degenerate (leaving only Gartner duct cysts as remnants)

Comparative male and female gonadal and genital duct development

Fig. 20.24 - Campbell Walsh Wein Urology: Male (left) vs. female (right) development from indifferent gonads through differentiated genital structures.

7. Diagram E: Mature Female Genital Tract (At Birth)

By birth, the Müllerian ducts have fused to form the fallopian tubes, uterus, and endocervix. Mesonephric duct remnants may persist as Gartner duct cysts in the anterolateral vaginal wall and as epoophoron/paroophoron in the adnexa.

Mature female genital tract showing fallopian tubes, uterus, ovary, cervix, vagina, and mesonephric remnants

Fig. 22.1B - Robbins & Kumar Pathologic Basis of Disease: Final anatomy of the female genital tract with labelled structures including corpus, cervix, fimbriae, ovarian ligament, mesovarium (broad ligament), mesonephric remnants, fornix, and vagina.

8. Key Developmental Summary Table

Structure	Embryological Origin
Fallopian tubes	Cranial + horizontal parts of paramesonephric duct
Uterus (corpus + cervix)	Fused caudal parts of paramesonephric ducts
Upper vagina (~upper 4/5)	Fused paramesonephric ducts + sinovaginal bulbs
Lower vagina (~lower 1/5)	Urogenital sinus (sinovaginal bulbs → vaginal plate)
Ovary	Cortical sex cords of indifferent gonad
Gartner duct cysts	Remnant of mesonephric (Wolffian) duct
Appendix vesiculosa	Remnant of cranial mesonephric tubules

9. Congenital Anomalies from Developmental Failure

Errors in paramesonephric duct development (around week 8) produce a spectrum of uterine anomalies:

Anomaly	Cause
Uterus didelphys (double uterus)	Failure of fusion of caudal paramesonephric ducts
Bicornuate uterus	Incomplete fusion - only superior body duplicated
Unicornuate uterus	One paramesonephric duct fails to develop
Septate uterus	Incomplete resorption of the uterine septum after fusion
Vaginal atresia / absence	Failure of sinovaginal bulbs to develop or canalize
Imperforate hymen	Failure of inferior vaginal plate to perforate

Sources:

Robbins & Kumar Pathologic Basis of Disease, Fig. 22.1
Langman's Medical Embryology, Fig. 16.27 - paramesonephric duct fusion
Campbell Walsh Wein Urology, Fig. 20.24 - male vs. female genital development
The Developing Human: Clinically Oriented Embryology - uterine anatomy and menstrual cycle

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