Abstract:
:Cellular locations, axonal projections, and synaptic effects of inhibitory vestibulocollic (VC) neurons activated by the ampullary nerve of the posterior semicircular canal (PCN) were studied in anesthetized cats. The inhibitory VC neurons were identified by their monosynaptic responses to PCN stimulation and by their antidromic responses to stimulation of the ipsilateral (i-) and contralateral (c-) neck extensor motoneuron pools, which are inhibitory targets of the PCN. They were classified as VCi (vestibulocollic neuron sending an axon to the i-neck extensor motoneuron pool) and VCc (vestibulocollic neuron sending an axon to the c-neck extensor motoneuron pool) neurons. Neither VCi nor VCc neurons were activated antidromically by localized stimulation of the ascending medial longitudinal fasciculus (asc. MLF) or the 3rd nuclei. Their cell somata were localized in the rostral part of the descending vestibular nucleus and the ventral part of the lateral vestibular nucleus. VCi and VCc neurons produced unitary IPSPs in neck extensor motoneurons in the C1 segment.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Isu N,Sakuma A,Hiranuma K,Ichikawa T,Uchino Ydoi
10.1016/0304-3940(90)90824-ssubject
Has Abstractpub_date
1990-11-13 00:00:00pages
163-6issue
2eissn
0304-3940issn
1872-7972pii
0304-3940(90)90824-Sjournal_volume
119pub_type
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