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]]