Labioscrotal folds

Labioscrotal folds

Infobox Embryology
Name = Labioscrotal folds
Latin =
GraySubject = 252
GrayPage = 1214


Caption = Stages in the development of the external sexual organs in the male and female.


Caption2 =
System =
CarnegieStage =
Precursor = genital tubercle
GivesRiseTo = Labia majora, Scrotum
MeshName =
MeshNumber =
DorlandsPre = s_31
DorlandsSuf = 12775207
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 [ [http://www.hsc.unt.edu/tcom2006/Scribes/REPRO%201%20SCRIBES/Repro23-MaleFemaleEmbryo2.doc HSC - Gonad Descent and Development of External Genitalia II] ]
* In the "male", they become the scrotum.

References

External links

* [http://sprojects.mmi.mcgill.ca/embryology/ug/Reproductives/Normal/Male_external.html "Development of Male External Genitalia", at mcgill.ca]
* [http://sprojects.mmi.mcgill.ca/embryology/ug/Reproductives/Normal/Female_external.html "Development of Female External Genitalia", at mcgill.ca]
* [http://www.mhhe.com/socscience/sex/common/ibank/ibank/0058b.jpgDiagram at mhhe.com]
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