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1. Intracellular recordings of synaptic potentials in extraocular motoneurons were studied to determine the connectivities between the utricular nerve and the extraocular motoneurons in cats. 2. Stimulating electrodes were placed within the left utricular nerve, while other branches of the vestibular nerve were removed. Subsequently, the N1 field potentials evoked by utricular nerve stimulation were recorded in the vestibular nuclei. The potential typically grew until reaching a plateau (submaximal stimulation). Stimulus spread to the other nerve branches appeared as an additional increase in N1 amplitude after the plateau discontinued (supramaximal stimulation). 3. Intracellular recordings were made from 200 identified motoneurons in the bilateral III, IV, and VI cranial nuclei. 4. Stimulation of the utricular nerve at submaximal intensity evoked a longer latency depolarizing and hyperpolarizing potentials in contra- and ipsilateral medial rectus motoneurons, respectively. Complex potentials with longer latencies also were recorded in ipsilateral inferior oblique and contralateral trochlear motoneurons after stimulation of the utricular nerve at a submaximal intensity. Monosynaptic and disynaptic connections between the utricular nerve and ipsilateral abducens motoneurons and interneurons were recorded as described previously. 5. The results of the present study confirm our initial findings that a disynaptic pathway from the utricular nerve to contralateral trochlear motoneurons is absent or very poorly developed, whereas polysynaptic circuits from the utricular nerve to inferior oblique and trochlear motoneurons may play a role in eye rotation during head tilt.
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
February 1961,
Archives internationales de physiologie et de biochimie,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
January 1927,
Annals of surgery,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
January 1968,
Fiziolohichnyi zhurnal,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
January 1994,
Neuroscience and behavioral physiology,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
January 1992,
Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
January 1989,
Experimental brain research,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
February 1994,
The Journal of neuroscience : the official journal of the Society for Neuroscience,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
May 1986,
No to shinkei = Brain and nerve,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
January 1952,
Acta psychiatrica et neurologica Scandinavica,
Y Uchino, and
M Sasaki, and
H Sato, and
M Imagawa, and
H Suwa, and
N Isu
November 1950,
Journal of neurophysiology,
