Gonadal ridge

Gonadal ridge

Infobox Embryology
Latin =
GraySubject = 252
GrayPage = 1207

Caption = Section of the fold in the mesonephros of a chick embryo of the fourth day. ("Genital ridge" labeled at left.)

Caption2 =
System =
CarnegieStage =
Precursor = urogenital folds
GivesRiseTo = sex cords
MeshName =
MeshNumber =
DorlandsPre = r_13
DorlandsSuf = 12711095
In embryology, the gonadal ridge (or genital ridgecite 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=] ) 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.

thumb|300px|left|A.—Diagram of the primitive urogenital organs in the embryo previous to sexual distinction. ">
* 3. Ureter.
* 4. Urinary bladder.
* 5. Urachus.
* cl. Cloaca.
* cp. Elevation which becomes clitoris or penis.
* i. Lower part of the intestine.
* ls. Fold of integument from which the labia majora or scrotum are formed.
* m, m. Right and left Müllerian ducts uniting together and running with the Wolffian ducts in gc, the genital cord.
* ot. The gonadal ridge from which either the ovary or testis is formed (upper right).
* ug. Sinus urogenitalis.
* W. Left Wolffian body.
* w, w. Right and left Wolffian ducts.


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