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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]].
 
* Terminals synapse with neurons in the ''''behaviour centre'''' in the [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|Hypothalamus]].
 
+
* 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.
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** Release nitric oxide (NO) from their terminals.
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** NO is the principle neurotransmitter that drives the erectile process.
    
'''''Local Vascular Component'''''
 
'''''Local Vascular Component'''''
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