Long-lasting depolarization of the central terminals of cutaneous afferents in L7 segment evoked by volleys ascending from the sacral cord in the cat.
1. In 72% of non-anaesthetized spinal cats, single volleys ascending from the sacral cord evoke long-lasting primary afferent depolarization in L7 segment. It occurs in the central terminals of cutaneous but not in Ia muscle afferents. 2. Volleys descending to L7 segment evoke only short-lasting presynaptic depolarization. 3. It is concluded that presynaptic inhibition in L7 segment produced by ascending volleys is more effective than that evoked by descending volleys.
Lupa
K
K
Department of Human Physiology, Medical School, Lublin, Poland.
Wójcik
G
G
Tarnecki
R
R
Niechaj
A
A
D000344:Afferent Pathways; D000818:Animals; D002415:Cats; D003655:Decerebrate State; D005727:Ganglia, Spinal / Q000502:physiology; D012447:Sacrum; D012867:Skin / Q000294:innervation*; D012879:Skin Physiological Phenomena; D013116:Spinal Cord / Q000502:physiology*; D013997:Time Factors