Search PubMed⌕ Search

Biomedical subjects

I Honjo

Publications and source records attributed to I Honjo.

262 records · Page 15Linked to original sources
PubMedDate not supplied

The origin of autonomic nerves of the middle ear as studied by the horseradish peroxidase tracer method.

Autonomic innervation of the middle ear mucosa was investigated by the horseradish peroxidase retrograde tracing method. The middle ear mucosa was found to be sympathetically innervated by the fibres originating in the ipsilateral superior cervical ganglion, but not by those originating in the stellate ganglion. The middle ear mucosa was also innervated by the fibres originating in the ipsilateral pterygopalatine ganglion, suggesting this innervation to be parasympathetic.

Animals↗
PubMedDate not supplied

The origin of autonomic nerves of the Eustachian tube as studied by the horseradish peroxidase tracer method.

Autonomic innervation of the Eustachian tube mucosa was investigated by the horseradish peroxidase retrograde tracing method. The Eustachian tube mucosa was found to be sympathetically innervated by fibres originating in the ipsilateral superior and middle cervical ganglia, but not by those originating in the stellate ganglion. The Eustachian tube mucosa was also innervated by fibres originating in the pterygopalatine ganglion, but not by those originating in the otic ganglion. The innervation from the pterygopalatine ganglion was considered to be parasympathetic.

Animals↗
PubMedDate not supplied

Electrophysiological and HRP studies of the direct afferent inputs from the cochlear nuclei to the tensor tympani muscle motoneurons in the cat.

The direct fiber connections from the cochlear nuclei to the tensor tympani muscle (TTM) motoneurons were investigated by means of electrophysiological and horseradish peroxidase (HRP) methods, using cats. When HRP was injected into motoneuron region of the TTM, HRP-labelled cells were found bilaterally in the dorsal cochlear nucleus (DCN) and ventral cochlear nucleus (VCN). When the electrical stimulus was applied to the cochlear nucleus, the TTM motoneurons fired spikes monosynaptically with s short latency. These histological and electrophysiological results indicate the existence of direct fiber connections from the bilateral cochlear nuclei to the TTM motoneurons.

Animals↗
PubMedDate not supplied

Central fiber connections of the vestibulo-autonomic reflex arc in cats.

The fiber connections associated with the vestibulo-autonomic reflex in the brain stem were investigated in cats using electrophysiological and horseradish peroxidase (HRP) methods. When the peripheral labyrinth was stimulated, the stomach constricted, and in some cases this constriction was strong and lasted for a relatively long period. This phenomenon was interpreted as a kind of vomiting triggered by the vestibuloautonomic reflex. When the electrical stimulus was applied to the peripheral labyrinth, the solitary tractus nuclear (SN) neurons, where the vagal nerve cell bodies exist, fired spikes with short latencies. When HRP was injected into the SN region, HRP-labelled cells were found in the parvocellular reticular nucleus (PC) and vestibular nuclei (VN). When HRP was injected into the PC region, HRP-labelled cells were found in the VN. These electrophysiological and histological results indicate the existence of the following fiber connections: (i) vestibular organs-VN-SN-(vagal nerve)-stomach, (ii) vestibular organs-VN-PC-SN-(vagal nerve)-stomach, associated with the vestibulo-autonomic reflex.

Animals↗
PubMedDate not supplied

The influence of middle ear pressure on the vestibular nerve activity in cats.

The influence of middle ear pressure on the vestibular nerve activities was investigated in anesthetized cats. The vestibular nerve activities were recorded intraaxonally and positive or negative pressure was applied to the middle ear cavity through a tympanic membrane perforation. The firing of vestibular nerve fibers, especially the regular type nerve that responded to horizontal semicircular canal stimulation, increased with positive pressure and decreased with negative pressure. Most vestibular nerves that responded to anterior or posterior semicircular canal stimulation were not influenced by changes in the middle ear pressure. These results indicate that middle ear pressure load is transmitted to the vestibular end organs and then to vestibular nerve.

Action Potentials↗