2 edition of Cerebellar and brainstem responses to extraocular muscle stretch in the cat found in the catalog.
Cerebellar and brainstem responses to extraocular muscle stretch in the cat
Robert David Tomlinson
|Other titles||Extraocular muscle stretch in the cat|
|Contributions||Toronto, Ont. University.|
|The Physical Object|
|Pagination||105,  leaves :|
|Number of Pages||105|
An H-reflex (also called a "Hoffmann reflex") is the earliest response of a muscle to stimulation of large afferent fibers in the muscle nerve. If the nerve stimulation also excites large efferent fibers, the H-reflex is typically preceded by an M wave (or M response), which reflects excitation of the muscle . cerebellar electrocortical activity evoked by various afferent pathways. "Electrical responses evoked in different regions of the cerebellar cortex of cat by stimulating various cerebello-petal pathways have been analyzed for their component postsynaptic potentials (p.s.p.'s).
The vestibulo–ocular reflex, because of its close relationship with the cerebellum and its marked adaptiveness, has become a model system for studying the functions of the cerebellum. It has been hypothesized that an evolutionarily old part of the cerebellum, the flocculus, forms a modifiable accessory pathway for the vestibulo–ocular reflex arc for adaptive control, and that the. extraocular muscles, a lesion affecting all of the nuclei will usually be manifested clinically as a strabismus affecting cranial nerve III (ventral lateral strabismus). The trochlear nerve acts to rotate the eyeball medio-ventrally (toward the nose). An abnormality of this nerve exclusively would be unusual. In a cat.
Both would help to increase the time constant of an imperfect neural integrator in the brain stem. We propose that in patients with CN the sign of the velocity pathway is reversed, making the neural integrator unstable. Kimura, M.: Mossy fiber projections to the cerebellar flocculus from the extraocular muscle afferents. Brain Res. descending motor control pathway, originating in the red nucleus, that mediates control of the limbs on the basis of cerebellar processing stretch reflex response to activation of the muscle spindle stretch receptor that causes contraction of the muscle to maintain a constant length supplemental motor area.
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Afferents from the extraocular muscles to the cerebellum of the cat were investigated by evoked potential techniques using muscle stretch as a stimulus.
Short (about 4 msec) latency responses occurred in the vermian folia anterior (Larsell's lobule V b, c) and posterior (lobules VI and VII) to the primary fissure under light Nembutal Cited by: The source of cerebellar evoked potentials synchronized with stretch of the extraocular muscle was investigated in the cat.
Short latency on and off evoked responses were recorded from the surface of the vermian cortex (Larsell's Lobules V b, c; VI; and VII) and the brain stem. Evoked potentials of equal amplitude and latency were recorded from the cerebellar surface after the cerebellar Cited by: 9. The cerebellar responses to the stretching of the extraocular muscles exhibited the same pattern observed for the masticatory stretches, that is, adaptation and rebound firing at the end of the stretch.
No somatotopical arrangement of single extraocular muscles was Cited by: Extraocular Muscle Input to the Cerebellar Cortex C.
BATINI Laboratoire de Psychophysiologie Sensorielle, Universite Pierre et Marie Curie, Paris (France) The involvement of the cerebellum in eye movement was demonstrated over years ago with the stimulation experiments of Hitzig () and has continued to be by: 6.
Afferents fromthe extraocular muscles to the cerebellum ofthe cat were investigated by evoked potential techniques using muscle stretch as astimulus. Short (about 4msec) latency responses occurred in the vermian folia anterior (Larsell's lobuleVb,c) andposterior (lobulesVIandVII)to the primaryfissure underlight Nembutalanaesthesia.
The. Inputs from extraocular muscles to the cerebellar flocculus were studied in anesthetized rabbits by recording neural responses either to electric stimulation to the nerve of the extraocular muscle or to the extraocular muscle stretch.
COOPER S, FILLENZ M. Afferent discharges in response to stretch from the extraocular muscles of the cat and monkey and the innervation of these muscles.
J Physiol. Feb 28; (2)– [PMC free article] Corfield R, Frosdick JP, Campbell FW. Grey-out elimination: the roles of spatial waveform, frequency and phase.
Cooper S., Fillenz nt discharges in response to stretch from the extraocular muscles of the cat and monkey and the innervation of these muscles J.
Physiol. (Lond.), (), pp. Google Scholar. COOPER S, FILLENZ M. Afferent discharges in response to stretch from the extraocular muscles of the cat and monkey and the innervation of these muscles. J Physiol. Feb 28; (2)– [PMC free article] COOPER S, DANIEL PM, WHITTERIDGE D.
Afferent impulses in the oculomotor nerve, from the extrinsic eye muscles. The cerebellar output function was studied using cerebellopetal proprioceptive stimulation hich produces simple and complex excitatory discharges as well as inhibitory activity in the Purkinje cells.
The activity of the intracerebellar nuclei (and of the entire brain stem) was measured by the energy consumption as revealed with the [14C]deoxyglucose method. Cerebellum, brain region that coordinates sensory input with muscular responses, located below and behind the cerebral hemispheres and above the medulla oblongata.
The cerebellum functions mainly in coordinating muscle activity for voluntary movements and in enabling fine muscle adjustments to maintain balance. In cats, anaesthetized with chloralose and paralysed, the responses of units in the right lateral thalamus were recorded while the extrinsic ocular muscles (EOM) of the right eye were stretched in the dark.
Phasic responses were found in all layers of the dorsal lateral geniculate nucleus (LGNd) and in the perigeniculate nucleus (PGN). A given unit usually responded to stretch of more than one. Inputs from extraocular muscles to the cerebellar flocculus were studied in anesthetized rabbits by recording neural responses either to electric stimulation to the nerve of the extraocular muscle.
The responses of units in the superficial layers of the superior colliculus to stretch of extrinsic ocular muscles (e.o.m.) and to visual stimuli, delivered singly and paired at various inter. The plant P is first-order filter with time constant s, and the brainstem controller B has an undergained (50%) direct pathway and a leaky integrator (TC = 1 s) in the indirect pathway (details in Methods).
(A) Eye-position response to sudden head displacement. The desired and post-training performances are effectively identical, so that only the latter is shown.
Four accumulations of gray substance embedded in the white substance of the cerebellum, comprising the nucleus dentatus, nucleus emboliformis, | Explore the latest full-text research PDFs. Stretch-evoked EMG activity of extraocular muscles Examples of stretch-evoked activity in 2 monkeys, m1 and m2 a – d and a rat, r2 e.
The upper trace indicates the force applied to. Rahn AC, Zuber BL. Cerebellar evoked potentials resulting from extraocular muscle stretch: evidence against a cerebellar origin. Exp Neurol. May; 31 (2)– Sasaki K, Strata P. Responses evoked in the cerebellar cortex by stimulating mossy fibre pathways to the cerebellum.
Exp Brain Res. ; 3 (2)– We investigated the effects of unilateral deafferentation of extraocular proprioception on the orienting behaviour of cats. The ophthalmic branch of the Vth cranial nerve, in which most of the extraocular proprioceptive fibers are known to run, was cut unilaterally in adult cats.
The animals had been previously trained to jump from a start box to a luminous target at various possible locations. Schwarz DW, Tomlinson RD. Neuronal responses to eye muscle stretch in cerebellar lobule VI of the cat.
Exp Brain Res. Jan 18; 27 (1)– Thach WT. Discharge of Purkinje and cerebellar nuclear neurons during rapidly alternating arm movements in the monkey. J Neurophysiol.
Sep; 31 (5)– Thach WT. COOPER S, FILLENZ M. Afferent discharges in response to stretch from the extraocular muscles of the cat and monkey and the innervation of these muscles.
J Physiol. Feb 28; (2)– [Google Scholar] COOPER S, DANIEL PM, WHITTERIDGE D. Afferent impulses in the oculomotor nerve, from the extrinsic eye muscles.E Manni's 91 research works with 1, citations and 2, reads, including: The work by Giulio Ceradini in explaining the mechanism of semilunar cardiac valve function.Hypertonia indicates an exaggerated muscle contraction response to a relatively moderate stretching stimulus, due to a relatively high sensitivity of the GTOs and MSs because of upregulation from the cerebellum because of certain cerebellar disorders (e.g.