Sprouting of sympathetic nerves in the absence of afferent input.
D000320:Adrenergic Fibers / Q000502:physiology*; D000344:Afferent Pathways; D000818:Animals; D003714:Denervation; D005728:Ganglia, Sympathetic / Q000502:physiology*; D006624:Hippocampus / Q000166:cytology*; D008297:Male; D051381:Rats