Labioscrotal folds

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The labioscrotal folds (or labioscrotal swellings, or genital swellings) are paired structures in the human embryo that represent the final stage of development of the caudal end of the external genitals before sexual differentiation. In both males and females the two swellings merge:

* In the female, they become the posterior labial commissure. The sides of the genital tubercle grow backward as the genital swellings, which ultimately form the labia majora; the tubercle itself becomes the mons pubis. In contrast, the labia minora are formed by the urogenital folds [1]
* In the male, they become the scrotum.

## References[edit | edit source]

1. ↑ HSC - Gonad Descent and Development of External Genitalia II

## External links[edit | edit source]

* "Development of Male External Genitalia", at mcgill.ca
* "Development of Female External Genitalia", at mcgill.ca
* Diagram at mhhe.com
* Template:EmbryologySwiss
* Template:LoyolaMedEd

Template:Gray's

* v
* t
* e

Development of the reproductive system

Precursors|

* Mesoderm
* intermediate
* lateral plate
* Endoderm
* Cloaca
* Urogenital sinus
* Ectoderm
* Cloacal membrane

Internal|

* Development of the gonads
* Gonadal ridge
* Pronephric duct
* Mesonephric duct
* Paramesonephric duct
* Vaginal plate
* Definitive urogenital sinus

External|

* Genital tubercle
* Labioscrotal swelling
* Primordial phallus
* Gubernaculum
* Peritoneum
* Vaginal process
* Canal of Nuck

See also|

* List of related male and female reproductive organs
* Prenatal development
* Embryogenesis

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