title: Types of afferents from the knee joint evoking sympathetic reflexes in cat inferior cardiac nerves.
abstract: In anesthetized cats electrical stimulation of the medial articular nerve of the knee joint evoked sympathetic reflex discharges in inferior cardiac nerves. Low intensity single stimuli elicited early reflex discharges (A-reflexes, latency 70-90 ms, duration 110-200 ms) whereas short tetanic stimulation at higher intensities evoked, in addition, late reflexes (C-reflexes, latency 390-480 ms, duration 230-400 ms). An analysis of the relation between the conduction velocity and the electrical threshold of 231 single medial articular nerve fibers revealed that the A-reflex is mainly due to activation of Group II units, whereas the C-reflex is evoked by activity in unmyelinated Group IV fibers.
mesh_terms: D000818:Animals; D002415:Cats; D004558:Electric Stimulation; D006321:Heart / Q000294:innervation*; D007719:Knee Joint / Q000294:innervation*; D009412:Nerve Fibers / Q000502:physiology; D009413:Nerve Fibers, Myelinated / Q000502:physiology; D009475:Neurons, Afferent; D011930:Reaction Time / Q000502:physiology; D012018:Reflex / Q000502:physiology*; D013564:Sympathetic Nervous System / Q000502:physiology*