Editing Gonad (section)

==Development==
{{Main article|Development of the gonads}}

The gonads develop from three sources; the mesothelium, underlying mesenchyme and the primordial germ cells. Gonads start developing as a common primordium (an organ in the earliest stage of development), in the form of [[genital ridge]]s,<ref name="Larsen1">{{cite book |last1=Schoenwolf |first1=Gary C. |title=Larsen's human embryology |date=2015 |publisher=Elsevier |isbn=978-1-4557-0684-6 |oclc=862800082 |page=16 |edition=5th}}</ref> at the sixth week, which are only later [[sexual differentiation|differentiated]] to male or female [[sex organ]]s (except when they are not differentiated). The presence of the [[SRY]] [[gene]],<ref>{{cite web|title=Human Developmental Genetics|url=http://www.pasteur.fr/ip/easysite/pasteur/en/research/scientific-departments/developmental-biology/units-and-groups/human-developmental-genetics|work=Institut Pasteur|access-date=4 June 2012|url-status=dead|archive-url=https://web.archive.org/web/20120505080019/http://www.pasteur.fr/ip/easysite/pasteur/en/research/scientific-departments/developmental-biology/units-and-groups/human-developmental-genetics|archive-date=5 May 2012}}</ref> located on the short arm of the [[Y chromosome]] and encoding the [[testis determining factor]], usually determines male sexual differentiation. In the absence of the SRY gene from the Y chromosome, usually the female sex (ovaries instead of testes) will develop. The [[development of the gonads]] is a part of the [[development of the urinary and reproductive organs]].{{cn|date=April 2025}}