scholarly journals Зв’язок активності висхідних шляхів із фазовим кодуванням у люмбальних відділах спинного мозку

2012 ◽  
Vol 3 (1) ◽  
pp. 140-145
Author(s):  
O. O. Shugurov
Keyword(s):  
Spinal Cord ◽  
Evoked Potentials ◽  
Dorsal Column ◽  
Additional Information ◽  
Spinocerebellar Tract ◽  
Relationship Of ◽  
The Relationship ◽  
Stimulation Of

We studied the relationship of discharges phase characteristics in ascending column of spinal cord (SC) and specificity of activation of neurones, which generate negative components of evoked potentials of SC. The discharges was recorded from SC at a level of a presence of dorsal column (DC), spinocervical and dorsal spinocerebellar tract in upper lumbar and thoracic segments at a stimulation of a nerve or DC. It is shown, that the phase of the discharges depends on the quantity of synaptic delays in generating chain of such signals. Thus, the phase of a signal can carry the additional information on specificity of activation of the sensory elements in CNS.

Spinal cord pathways mediating somatosensory evoked potentials

1982 ◽  
Vol 57 (4) ◽  
pp. 472-482 ◽  
Author(s):  
Stephen K. Powers ◽  
Catherine A. Bolger ◽  
Michael S. B. Edwards
Keyword(s):  
Spinal Cord ◽  
Evoked Potentials ◽  
Somatosensory Evoked Potentials ◽  
High Intensity ◽  
Dorsal Column ◽  
Motor Threshold ◽  
Spinal Cord Lesions ◽  
Content Type ◽  
Spinocerebellar Tract ◽  
Fine Print

✓ Using a CO2 laser, discrete thoracic spinal cord lesions were made in cats anesthetized with ketamine and xylazine (Rompun). Differences in cortical somatosensory evoked potentials (SEP's) produced with high-intensity stimulation (20 times the motor threshold) of each posterior tibial nerve were determined for nine different combinations of unilateral spinal cord lesions. The results of these studies show that nerve fibers in the ipsilateral dorsal column, the ipsilateral dorsal spinocerebellar tract, and the contralateral ventrolateral tracts with respect to the side of leg stimulation, contribute to cortical SEP's. A lesion of the dorsal spinocerebellar tract affected only the early waves (< 30 msec) of the SEP from leg stimulation ipsilateral to the side of the lesion, whereas a solitary lesion of the ventrolateral tract caused changes primarily in the amplitude of later waves (> 30 msec) of the SEP produced by contralateral leg stimulation. Lesions involving one-half of the dorsal column caused changes in the amplitude of both the early and late waves produced by stimulation ipsilateral to the side of the lesion. The effects of various combinations of lesions on the cortical SEP's were not additive, which indicates significant interaction between afferent pathways. These findings suggest that high-intensity peripheral nerve stimulation, which activates both C and A fibers, could be used intraoperatively to assess spinal cord function with more accuracy than the current practice of using a stimulus strength of twice the motor threshold. The importance of using anesthetic agents that do not depress cortical activity (which may affect the later components of the SEP) is also emphasized.

The Relationship of Substance use and the Onset of Spinal Cord Injuries

2019 ◽  
Vol 100 (10) ◽  
pp. e133-e134
Author(s):  
Lori Eldridge ◽  
Jennifer Piatt ◽  
Jon Agley ◽  
Steven Gerke
Keyword(s):  
Spinal Cord ◽  
Substance Use ◽  
Spinal Cord Injuries ◽  
Relationship Of ◽  
The Relationship

scholarly journals Application of multishot diffusion tensor imaging in spinal cord tumors

2019 ◽  
Vol 5 (1) ◽  
pp. 59-64
Author(s):  
Jiefei Li ◽  
Le He ◽  
Yuqi Zhang
Keyword(s):  
Spinal Cord ◽  
Diffusion Tensor Imaging ◽  
Diffusion Tensor ◽  
Preoperative Imaging ◽  
Spinal Cord Tumors ◽  
Intramedullary Tumors ◽  
Routine Magnetic Resonance Imaging ◽  
Relationship Of ◽  
The Relationship ◽  
Diffusion Tensor Imaging Dti

Objective: To explore the usefulness of multishot diffusion tensor imaging (DTI) for evaluating the neurological function of patients with spinal cord tumors Methods: Routine magnetic resonance imaging and multishot DTI were performed in five patients with spinal cord tumors. The values of fractional anisotropy (FA) and radial diffusivity (RD) were analyzed. Results: Multishot DTI of spinal cord tumors allowed for defining the margins of tumors and determining the relationship of tumors with the adjacent white matter structures of the spinal cord. Multishot DTI demonstrated significantly increased RD and decreased FA of spinal cord tumors compared with those of the normal spinal cord. Conclusions: Multishot DTI is a potentially useful modality for differentiating resectable tumors from nonresectable ones based on preoperative imaging alone as well as for differentiating intramedullary tumors from extramedullary ones. Further prospective studies are warranted to confirm these results.

Evoked potentials elicited on the cerebellar cortex by electrical stimulation of the rat spinocerebellar tract

2009 ◽  
Vol 72 (4) ◽  
pp. 395-400 ◽  
Author(s):  
Hiroyuki Muramatsu ◽  
Kyouichi Suzuki ◽  
Tatsuya Sasaki ◽  
Masato Matsumoto ◽  
Jun Sakuma ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Evoked Potentials ◽  
Cerebellar Cortex ◽  
Spinocerebellar Tract ◽  
Stimulation Of

Responses of Redroot Pigweed (Amaranthus retroflexus) and Witchgrass (Panicum capillare) Seeds to Anesthetics

Weed Science ◽  
1989 ◽  
Vol 37 (1) ◽  
pp. 93-97 ◽  
Author(s):  
Ray B. Taylorson
Keyword(s):  
Relative Activity ◽  
Amaranthus Retroflexus ◽  
Anesthetic Activity ◽  
Stimulatory Action ◽  
Good Relationship ◽  
Redroot Pigweed ◽  
Relationship Of ◽  
The Relationship ◽  
Active Substances ◽  
Stimulation Of

Substances having anesthetic-like properties were examined for stimulation of redroot pigweed and witchgrass seed germination. Chemicals included the n-alcohols through C-5, 2-propanol, benzyl alcohol, diethyl ether, chloroform, and 2-bromo-2-chloro-1,1,1-trifluoroethanol. Redroot pigweed seeds required the far-red absorbing form of phytochrome (Pfr) for an anesthetic substance to increase germination, but in witchgrass seeds the active anesthetic substances stimulated germination without added Pfr. The correlation coefficient comparing relative activity (RA) versus the membrane/buffer partition coefficient (M/B) of the active substances was very poor (−0.37) for pigweed seeds but was −0.91 for witchgrass. Leakage of cellular materials, including electrolytes, substances absorbing at 280 nm, and amino acids from seeds treated with either active or inactive anesthetics, was not particularly indicative of effects on germination in both species. Application of increased pressure (0.965 MPa) during anesthetic treatment, which in animals prevents anesthesia, was found to act oppositely and increase seed response to ethanol in redroot pigweed seeds, but in witchgrass seeds pressure suppressed the stimulatory action of ethanol. In both species, pressure appeared to have an action of its own, but for this action to be expressed the presence of a stimulatory anesthetic was also required. The results do not appear to support a good relationship of anesthetic activity with seed membrane lipophilic components in redroot pigweed seeds, but the relationship seems likely for witchgrass seeds.

The Cultural Affiliations and Chronological Position of the Clear Fork Focus

1947 ◽  
Vol 13 (2) ◽  
pp. 97-109 ◽  
Author(s):  
J. Charles Kelley
Keyword(s):  
Large Scale ◽  
Temporal Distribution ◽  
University Of Texas ◽  
Projectile Points ◽  
Additional Information ◽  
Central Texas ◽  
The University ◽  
Relationship Of ◽  
Archaeological Cultures ◽  
The Relationship

The importance of the Clear Fork Focus as a pre-pottery archaeological complex of north-central Texas has become generally known to archaeologists through the industry of its discoverer and principal proponent, Dr. Cyrus N. Ray, of Abilene, Texas. Unfortunately, the relationship of this complex to other and comparable archaeological cultures of Texas has been largely neglected and some regrettable misinformation in regard to its chronological position has been widely disseminated. In this paper the cultural affiliations and age of the Clear Fork Focus will be discussed in terms of the evidence presented by its discoverers and from the standpoint of new data derived from large scale excavations completed by the University of Texas in the terraces of the Colorado River near Austin, Texas. Additional information obtained by the writer through study of some twelve thousand projectile points from central, south, and western Texas, and their geographic and temporal distribution also is used.

Abnormally large evoked potentials arising from dorsal column fibers in the region of chronically compressed spinal cord

1999 ◽  
Vol 110 (2) ◽  
pp. 305-316 ◽  
Author(s):  
Yuichi Hoshino ◽  
Takahide Kurokawa ◽  
Toshinori Hongo ◽  
Shigeto Sasaki
Keyword(s):  
Spinal Cord ◽  
Evoked Potentials ◽  
Dorsal Column
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