The [[Hypothalamus_- Anatomy & Physiology|hypothalamus]] is inherently female. [[Testes Endocrine Function_- Anatomy & Physiology|Testosterone]] 'defeminizes' the brain during embryogenesis and eliminates the GnRH surge centre in males. The female foetus has no testes to produce [[Testes Endocrine Function_- Anatomy & Physiology|testosterone]], thus developes a [[Hypothalamus_- Anatomy & Physiology|hypothalamic]] GnRH surge centre.
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The [[Hypothalamus_- Anatomy & Physiology|hypothalamus]] is inherently female. [[Testes Endocrine Function_- Anatomy & Physiology|Testosterone]] 'defeminizes' the brain during embryogenesis and eliminates the GnRH surge centre in males. The female foetus has no testes to produce [[Testes Endocrine Function_- Anatomy & Physiology|testosterone]], thus develops a [[Hypothalamus_- Anatomy & Physiology|hypothalamic]] GnRH surge centre.