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'''''Nervous Component'''''
 
'''''Nervous Component'''''
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* Arousal driven
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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.
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** Extrinsic stimuli are called '''erotogenic stimuli'''.
    
'''''Local Vascular Component'''''
 
'''''Local Vascular Component'''''
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