Genital tubercle

Genital tubercle

Infobox Embryology
Name = PAGENAME
Latin =
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Caption = Stages in the development of the external sexual organs in the male and female.


Caption2 =
System =
CarnegieStage =
Precursor = somatopleurecite book |author=Netter, Frank H.; Cochard, Larry R. |title=Netter's Atlas of human embryology |publisher=Icon Learning Systems |location=Teterboro, N.J |year=2002 |pages=159 |isbn=0-914168-99-1 |oclc= |doi=] | GivesRiseTo = genital swelling, mons pubis, clitoris, penis
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DorlandsPre = t_21
DorlandsSuf = 12827779
A genital tubercle is a body of tissue present in the development of the urinary and reproductive organs. It forms in the ventral, caudal region of mammalian embryos of both sexes, and eventually develops into a phallus. In the human fetus the genital tubercle develops around week 4 of gestation, and by week 9 becomes recognizably either a clitoris or penis.

Even after the phallus is developed, the term genital tubercle remains, but only as the terminal end of it [http://www.med.unc.edu/embryo_images/unit-genital/genital_htms/genital024.htm The University of North Carolina at Chapel Hill - Embryo images nr 024] ] , which develops into either the glans penis or the glans clitoridis.

The genital tubercle is sensitive to dihydrotestosterone and rich in 5-alpha-reductase, so that the amount of fetal testosterone present after the second month is a major determinant of phallus size at birth.

ee also

*Sexual differentiation

References

External links

*
* [http://sprojects.mmi.mcgill.ca/embryology/ug/Reproductives/Normal/Male_external.html Overview at mcgill.ca]


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