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Crossed actions of group I muscle afferents in the cat.
Author(s) -
Harrison P J,
Zytnicki D
Publication year - 1984
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1984.sp015463
Subject(s) - excitatory postsynaptic potential , inhibitory postsynaptic potential , reflex , neuroscience , stimulation , reciprocal inhibition , chloralose , cats , withdrawal reflex , neurotransmission , chemistry , anatomy , medicine , biology , receptor
Reflex actions evoked by electrical stimulation of contralateral quadriceps, hamstring and gastrocnemius‐soleus muscle afferents were investigated using intracellular recording from motoneurones, in chloralose‐anaesthetized, acute, low spinal cats. Contralateral group I afferents were found to evoke excitatory post‐synaptic potentials only occasionally. Contralateral group II afferents evoked post‐synaptic potentials (excitatory to extensor motoneurones and inhibitory to flexor motoneurones) from the quadriceps nerve, whereas contralateral group III afferents evoked post‐synaptic potentials (with the same pattern as quadriceps group II) from all muscles tested. Contralateral group I afferents were found to facilitate Ia reciprocal inhibition, and both the excitatory and inhibitory reflex actions from Ib afferents. This is taken to indicate an action of these afferents on interneurones interposed in ipsilateral reflex pathways.