Showing papers on "Cuneate nucleus published in 1981"
TL;DR: The spatial and temporal properties of the early portion of the somatosensory evoked potential (SEP) were assessed in normal human subjects and in monkeys, cats, and rats, suggesting direct correspondences between human and animal components.
165 citations
TL;DR: Findings demonstrate that the glossopharyngeal nerve has more widely distributed brain stem projections that the vagus nerve and provide essential information on projection sites of visceral and taste inputs to the central nervous system.
Abstract: Brain stem projections of the glossopharyngeal and vagus nerves in the cat were studied using the anterograde transport of horseradish peroxidase (HRP). Crystalline HRP was applied to the proximal cut ends of the nerves for a period of 4–10.5 h, and after a survival time of 24–120 h, transverse and horizontal sections of the brain stem were processed according to the tetramethylbenzidine method. Labeled fibers from both nerves were found to project bilaterally to the solitary complex, and ipsilaterally to the ventral region of the external cuneate nucleus and to the medial region of the nucleus praepositus hypoglossi, just dorsolateral to the medial longitudinal fasciculus. Within the solitary complex terminal labeling was found in the parvocellular, ventrolateral, lateral, medial and commissural solitary nuclei. Exclusive glossopharyngeal nerve projections were found ipsilaterally in the rostral dorsal motor nucleus of the vagus, the ventrolateral portion of the medial cuneate nucleus, the dorsal part of the nuclei caudalis and interpolaris of the trigeminal complex, the nuclei insulae cuneati lateralis, and the dorsolateral aspect of the nucleus medullae oblongata centralis. Finally, in the area postrema a bilateral projection of vagal and an ipsilateral projection of glossopharyngeal fibers were found. These findings demonstrate that the glossopharyngeal nerve has more widely distributed brain stem projections than the vagus nerve and provide essential information on projection sites of visceral and taste inputs to the central nervous sytem.
113 citations
TL;DR: The termination of a pathway recently discovered in monkey, from the external cuneate nucleus (ECN) to the thalamus, has been investigated with the degeneration method and it may be a direct route for proprioceptive information to the cerebral cortex.
48 citations
TL;DR: Under general anesthesia, rats were gradually cooled from 37 degrees C to 24 degrees C, Slowly cooling avoided large temperature gradients between central and peripheral nervous systems and suggested that cooling slows synaptic transmission much more than fiber conduction.
46 citations
TL;DR: The results suggest that most of the ‘small cells’ which were densely labeled by [ 3 H]proline in earlier light-microscopic experiments are macroglial cells, which suggests that, along with neurons, glial cells may also be involved in the transfer of certain incorporated amino acids from one region of the brain to another.
38 citations
TL;DR: Using the horseradish peroxidase technique on the North American opossum, it is able to locate the neurons within the dorsal column and lateral cuneate nuclei which innervate the cerebellum and thalamus as well as those within the anterior lobe and dorsal columnuclei which project spinalward.
Abstract: Using the horseradish peroxidase technique on the North American opossum, we were able to locate the neurons within the dorsal column and lateral cuneate nuclei which innervate the cerebellum and thalamus as well as those within the dorsal column nuclei which project spinalward. The medial and lateral cuneate nuclei supply axons to the anterior lobe, the paramedian lobule and the pyramis of the cerebellum and the lateral cuneate nucleus provides an additional projection to the uvula. The cerebellar projections from these nuclei arise from neurons located rostral to the obex. The thalamic projections from the gracile and medial cuneate nuclei originate from neurons throughout their rostral to caudal extent, although most of them are located just rostral to the obex. Neurons within the lateral cuneate nucleus which innervate the thalamus are found at intermediate rostrocaudal levels where most of them approximate the medial cuneate nucleus. The medial cuneate also projects to at least lumbar levels of the spinal cord in the opossum and neurons giving rise to such connections are found at the level of the obex and caudal to it. Neurons within the dorsal part of the dorsal column nuclei were labelled only after thalamic injections. Our results in the opossum are compared with those obtained in several placental mammals.
32 citations
TL;DR: In a sample of 1700 neurons recorded from the dorsal column nuclei of the cat, 44 (2.6%) were found to send an axon down the dorsal spinal cord, which probably comprises an important subset that regulates the flow of sensory information in spinal and brainstem somatic sensory pathways.
27 citations
TL;DR: Stumps of rat forelimb peripheral nerves were soaked in horseradish peroxidase solution and Impregnation of the median, ulnar, radial, and musculocutaneous nerves revealed that each nerve had definite projection zones in the cuneate nucleus.
24 citations
TL;DR: There is a significant positive correlation between peripheral receptive field area and neuron locus within the rostrocaudal extent of the raccoon cuneate nucleus for units having tactile RFs on the glabrous surfaces of the forepaw digits.
8 citations
TL;DR: Functional significance of the intramodality and cross modality inhibition of cuneate neurons is discussed and two J units were found to be inhibited by steady pressure applied to the shoulder region of the contralateral forelimb.
8 citations
TL;DR: The input-output relationship of a nucleus is defined here as the total spike activity leaving the nucleus as a function of the total activity entering the nucleus measured over an appropriate time interval, and good agreement is found between the average IO curves generated from the evoked potential and pooled single cell measurements.
TL;DR: In the neonatal kitten, cuneate neurones activated by tactile stimulation of the forelimb foot pads are divisible into 3 functional classes each of which appears to receive its glabrous skin input selectively from a single class of tactile receptors.
TL;DR: Glutamic acid dehydrogenase activity was observed both in the neuropil as well as in several classes of cuneate neurons in the cat.
Abstract: Glutamic acid dehydrogenase activity was observed both in the neuropil as well as in several classes of cuneate neurons in the cat.