Bulbospinal connections to intercostal motoneurones following a chronic lateral spinal cord lesion
| Autor: | Peter A. Kirkwood, Tim W. Ford |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Pulmonary and Respiratory Medicine
Male Physiology Anaesthetized cats Intercostal nerves Lesion 03 medical and health sciences 0302 clinical medicine medicine Animals Spinal cord injury Spinal Cord Injuries Lower thoracic spinal cord Motor Neurons Medulla Oblongata business.industry General Neuroscience Anatomy musculoskeletal system medicine.disease Electrophysiology nervous system 030228 respiratory system Cats Spinal cord lesion Female Intercostal Nerves medicine.symptom business 030217 neurology & neurosurgery |
| Zdroj: | Respiratory physiologyneurobiology. 284 |
| ISSN: | 1878-1519 |
| Popis: | Previous evidence from electrophysiological experiments in anaesthetized cats with a chronic lateral lesion of the lower thoracic spinal cord indicated an expansion of the functional projections of expiratory bulbospinal neurones (EBSNs) in the segment above the lesion, measured at 16 weeks post-lesion. Here we investigate connections made by the same EBSNs to motoneurones in that segment, using cross-correlations between their discharges. The connections to the internal intercostal nerve motoneurones were found to be no different from controls. However, a significant increase was found in the number of connections between EBSNs and γ motoneurones of the external intercostal nerve (8/24, compared to 1/16) with possibly additional connections to the α motoneurones of the same nerve. Increased connections to the γ motoneurones of the internal intercostal nerve could not be ruled out. The expanded functional projections are thus likely to include new connections to γ motoneurones. We suggest that γ motoneurones may be inherently more receptive to new inputs. If so, the previously discounted role of abnormal fusimotor discharges in motor disorders would be worth reconsideration. |
| Databáze: | OpenAIRE |
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