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* Must be appropriate sensory stimuli (tactile, visual, olfactory, auditory) in order for the central nervous system to be stimulated for efferent events to cause erection.
 
* Must be appropriate sensory stimuli (tactile, visual, olfactory, auditory) in order for the central nervous system to be stimulated for efferent events to cause erection.
 
** Extrinsic stimuli are called '''erotogenic stimuli'''.
 
** Extrinsic stimuli are called '''erotogenic stimuli'''.
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* Stimuli cause afferent sensory nerves to fire.
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* Terminals synapse with neurons in the ''''behaviour centre'''' in the hypothalamus.
    
'''''Local Vascular Component'''''
 
'''''Local Vascular Component'''''
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