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* Stimuli cause afferent sensory nerves to fire.
 
* Stimuli cause afferent sensory nerves to fire.
* Terminals synapse with neurons in the ''''behaviour centre'''' in the [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|Hypothalamus]].
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* Terminals synapse with neurons in the ''''behaviour centre'''' in the [[Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|Hypothalamus]].
 
* Hypothalamic neurones synapse with parasympathetic and sympathetic efferent neurons that control penile vascular smooth muscle (vascular tone).
 
* Hypothalamic neurones synapse with parasympathetic and sympathetic efferent neurons that control penile vascular smooth muscle (vascular tone).
 
* Firing of '''Nonadrenergic, noncholinergic (NANC) parasympathetic neurones''' causes erection.
 
* Firing of '''Nonadrenergic, noncholinergic (NANC) parasympathetic neurones''' causes erection.
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* For more information on anatomy of the penis follow [[this link]].
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* For more information on anatomy of the penis follow this link.