Properties of utricular nerve-activated vestibulospinal neurons in cats

1996 ◽  
Vol 112 (2) ◽  
Author(s):  
H. Sato ◽  
K. Endo ◽  
H. Ikegami ◽  
M. Imagawa ◽  
M. Sasaki ◽  
...  
Keyword(s):  
Utricular Nerve ◽  
Vestibulospinal Neurons

Utriculoocular reflex arc of the cat

1996 ◽  
Vol 76 (3) ◽  
pp. 1896-1903 ◽  
Author(s):  
Y. Uchino ◽  
M. Sasaki ◽  
H. Sato ◽  
M. Imagawa ◽  
H. Suwa ◽  
...  
Keyword(s):  
Head Tilt ◽  
Vestibular Nuclei ◽  
Intracellular Recordings ◽  
Additional Increase ◽  
Extraocular Motoneurons ◽  
Eye Rotation ◽  
Reflex Arc ◽  
Supramaximal Stimulation ◽  
Utricular Nerve ◽  
Stimulation Of

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.

Neurogenetical segregation of the vestibulospinal neurons in the rat

1993 ◽  
Vol 620 (1) ◽  
pp. 149-154 ◽  
Author(s):  
Yasuko Kitao ◽  
Shigeo Okoyama ◽  
Tetsuji Moriizumi ◽  
Motoi Kudo
Keyword(s):  
Vestibulospinal Neurons

Spatial Alignment of Rotational and Static Tilt Responses of Vestibulospinal Neurons in the Cat

1999 ◽  
Vol 82 (2) ◽  
pp. 855-862 ◽  
Author(s):  
S. I. Perlmutter ◽  
Y. Iwamoto ◽  
J. F. Baker ◽  
B. W. Peterson
Keyword(s):  
Horizontal Plane ◽  
Dimensional Space ◽  
Body Position ◽  
Three Dimensional ◽  
Whole Body ◽  
Angular Difference ◽  
Spatial Alignment ◽  
Minimum Sensitivity ◽  
Alert Cats ◽  
Vestibulospinal Neurons

The responses of vestibulospinal neurons to 0.5-Hz, whole-body rotations in three-dimensional space and static tilts of whole-body position were studied in decerebrate and alert cats. The neurons’ spatial properties for earth-vertical rotations were characterized by maximum and minimum sensitivity vectors ( R max and R min) in the cat’s horizontal plane. The orientation of a neuron’s R max was not consistently related to the orientation of its maximum sensitivity vector for static tilts ( T max). The angular difference between R max and T max was widely distributed between 0° and 150°, and R max and T max were aligned (i.e., within 45° of each other) for only 44% (14/32) of the neurons. The alignment of R max and T max was not correlated with the neuron’s sensitivity to earth-horizontal rotations, or to the orientation of R max in the horizontal plane. In addition, the extent to which a neuron exhibited spatiotemporal convergent (STC) behavior in response to vertical rotations was independent of the angular difference between R max and T max. This suggests that the high incidence of STC responses in our sample (56%) reflects not only canal-otolith convergence, but also the presence of static and dynamic otolith inputs with misaligned directionality. The responses of vestibulospinal neurons reflect a complex combination of static and dynamic vestibular inputs that may be required by postural reflexes that vary depending on head, trunk, and limb orientation, or on the frequency of stimulation.

Axonal pathways and projection levels of anterior semicircular canal nerve-activated vestibulospinal neurons in cats

2006 ◽  
Vol 406 (1-2) ◽  
pp. 1-5 ◽  
Author(s):  
Naoharu Kitajima ◽  
Akemi Sugita-Kitajima ◽  
Rishu Bai ◽  
Mitsuyoshi Sasaki ◽  
Hitoshi Sato ◽  
...  
Keyword(s):  
Semicircular Canal ◽  
Anterior Semicircular Canal ◽  
Vestibulospinal Neurons

Properties and axonal trajectories of posterior semicircular canal nerve-activated vestibulospinal neurons

2008 ◽  
Vol 191 (3) ◽  
pp. 257-264 ◽  
Author(s):  
Keisuke Kushiro ◽  
Rishu Bai ◽  
Naoharu Kitajima ◽  
Akemi Sugita-Kitajima ◽  
Yoshio Uchino
Keyword(s):  
Semicircular Canal ◽  
Posterior Semicircular Canal ◽  
Vestibulospinal Neurons

scholarly journals Firing Patterns of Rat Vestibulospinal Neurons during Quadrupedal Standing on a Pitching Platform

2006 ◽  
Vol 56 (5) ◽  
pp. 389-392
Author(s):  
S. Fujiwara ◽  
T. Saito ◽  
F. Tian ◽  
T. Yamaguchi
Keyword(s):  
Firing Patterns ◽  
Vestibulospinal Neurons
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