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Red nucleus inputs to retractor bulbi motoneurones in the cat.
Author(s) -
Grant K,
Horcholle-Bossavit G
Publication year - 1986
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.1986.sp015977
Subject(s) - excitatory postsynaptic potential , red nucleus , inhibitory postsynaptic potential , neuroscience , abducens nucleus , nucleus , oculomotor nucleus , stimulation , chemistry , synaptic potential , anatomy , biology , central nervous system , midbrain
Rubral projections to retractor bulbi motoneurones were investigated by intracellular recording in the accessory abducens nucleus in the cat. Their post‐synaptic effects were compared with those of trigeminal afferent pathways. Post‐synaptic potentials evoked by stimulation of the contralateral red nucleus were predominantly excitatory, with latencies in the monosynaptic range. Post‐synaptic potentials evoked by stimulation of the ipsilateral red nucleus, at threshold, were predominantly inhibitory with latencies indicating a di‐ or trisynaptic pathway. At above threshold intensity, an earlier excitatory post‐synaptic potential (e.p.s.p.) preceded the inhibitory post‐synaptic potential (i.p.s.p.) in about half the recorded neurones. Convergence of rubral and trigeminal inputs was also observed in other neurones, not identified as retractor bulbi motoneurones, but situated within the accessory abducens nucleus.