Gonadal ridge
4765279
200627036
2008-03-24T20:41:50Z
Uwe Gille
211241
+de
{{Infobox Embryology |
Name = {{PAGENAME}} |
Latin = |
GraySubject = 252 |
GrayPage = 1207 |
Image = Gray1106.png |
Caption = Section of the fold in the mesonephros of a chick [[embryo]] of the fourth day. ("Genital ridge" labeled at left.) |
Image2 = |
Caption2 = |
System = |
CarnegieStage = |
Precursor = [[urogenital folds]] |
GivesRiseTo = [[sex cords]] |
MeshName = |
MeshNumber = |
DorlandsPre = r_13 |
DorlandsSuf = 12711095 |
}}
In [[embryology]], the '''gonadal ridge''' (or '''genital ridge'''<ref name="isbn0-914168-99-1">{{cite 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=177 |isbn=0-914168-99-1 |oclc= |doi=}}</ref>) is the precursor to the [[gonads]]. The [[gonadal ridge]] initially consists mainly of [[mesenchyme]] and cells of underlying mesonephric origin. Once oogonia enter this area they attempt to associate with these somatic cells. Development proceeds and the oogonia become fully surrounded by a layer of cells (pre-[[granulosa cells]]).
It gives rise to the [[sex cords]].
The gonadal ridge appears at approximately five weeks.
[[Image:Gray1110-1.png|thumb|300px|left|A.—Diagram of the primitive urogenital organs in the embryo previous to sexual distinction.
<BR>* 3. Ureter.
<BR>* 4. Urinary bladder.
<BR>* 5. Urachus.
<BR>* cl. Cloaca.
<BR>* cp. Elevation which becomes clitoris or penis.
<BR>* i. Lower part of the intestine.
<BR>* ls. Fold of integument from which the labia majora or scrotum are formed.
<BR>* m, m. Right and left Müllerian ducts uniting together and running with the Wolffian ducts in gc, the genital cord.
<BR>* ot. The '''gonadal ridge''' from which either the ovary or testis is formed (upper right).
<BR>* ug. Sinus urogenitalis.
<BR>* W. Left Wolffian body.
<BR>* w, w. Right and left Wolffian ducts.]]
==References==
{{reflist}}
==External links==
* {{EmbryologySwiss|cgametogen/keimbahn02}}
{{Development of urinary and reproductive systems}}
{{developmental-biology-stub}}[[Category:Embryology]]
[[de:Genitalleiste]]