The afferent fibres of the sympathetic nervous system.
D000320:Adrenergic Fibers / Q000033:anatomy & histology*; D000344:Afferent Pathways / Q000033:anatomy & histology; D000818:Animals; D002415:Cats; D005727:Ganglia, Spinal / Q000033:anatomy & histology*; D009410:Nerve Degeneration; D009412:Nerve Fibers / Q000648:ultrastructure