A gonad or sex gland or reproductive gland[1] is a mixed gland that produces the gametes (sex cells) and sex hormones 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.[2] 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.


The gonads are controlled by luteinizing hormone and follicle-stimulating hormone, produced and secreted by gonadotropes in the anterior pituitary gland.[3] This secretion is regulated by gonadotropin-releasing hormone produced in the hypothalamus.[4][5]


Gonads start developing as a common primordium (an organ in the earliest stage of development), in the form of gonadal ridges,[6] and only later are differentiated to male or female sex organs. The presence of the SRY gene,[7] located on the Y chromosome and encoding the testis determining factor, determines male sexual differentiation. In the absence of the SRY gene from the Y chromosome, 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.

See also


  1. ^ http://dictionary.reference.com/browse/sex+gland?r=66
  2. ^ http://www.macmillandictionary.com/dictionary/american/gonad
  3. ^ "gonadotropin". The Free Dictionary. Mosby's Medical Dictionary, 8th edition. Elsevier. 2009. Retrieved 4 June 2012. 
  4. ^ John W. Kimball (12 February 2011). "Hormones of the Hypothalamus: Gonadotropin-releasing hormone (GnRH)". Kimball's Biology Pages. John W. Kimball (The Saylor Foundation). Retrieved 4 June 2012. 
  5. ^ Marieb, Elaine (2013). Anatomy & physiology. Benjamin-Cummings. p. 915. ISBN 9780321887603. 
  6. ^ 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. PMID 1769902. 
  7. ^ "Human Developmental Genetics". Institut Pasteur. Institut Pasteur. Archived from the original on 5 May 2012. Retrieved 4 June 2012.