A gonad or sex gland or reproductive gland is an endocrine gland that produces the gametes (germ cells) of an organism. In the female of the species the reproductive cells are the egg cells, and in the male the reproductive cells are the sperm. The male gonad, the testicle, produces sperm in the form of spermatozoa. The female gonad, the ovary, produces egg cells. Both of these gametes, are haploid germ cells.
^Satoh M.; Anat J. (August 1991). "Histogenesis and organogenesis of the gonad in human embryos". PubMed (National Center for Biotechnology Information, U.S. National Library of Medicine) (Abstract). Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tokyo, Japan. PMID1769902.Missing or empty |url= (help);|accessdate= requires |url= (help)