Pathways mediating abdominal phasic flexor muscle activity in crayfish with chronically cut nerve cords
| Autor: | Kirk, Glidden R, Young Sm, Jackson Da, Lee Mt |
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| Rok vydání: | 1995 |
| Předmět: |
Nervous system
Male Cord Time Factors Physiology Stimulation Astacoidea Lesion Behavioral Neuroscience Neural Pathways medicine Animals Ecology Evolution Behavior and Systematics Abdominal Muscles Procambarus clarkii Motor Neurons biology Proprioception Behavior Animal Electromyography musculoskeletal neural and ocular physiology Anatomy musculoskeletal system biology.organism_classification Denervation Ganglion body regions medicine.anatomical_structure nervous system Abdomen Animal Science and Zoology Female medicine.symptom |
| Zdroj: | Journal of comparative physiology. A, Sensory, neural, and behavioral physiology. 176(1) |
| Popis: | 1. Nerve cord transection abolishes the ability of crayfish (Procambarus clarkii) to produce tailflips in response to gradually applied tactile or proprioceptive stimulation of the abdomen, but this ability eventually returns. To determine the time-course of this return and to analyze its underlying neural pathways, we made behavioral observations, electromyographic recordings from abdominal phasic flexor muscles, and intracellular recordings from motoneurons in crayfish with cord lesions between the thorax and the abdomen. 2. Abdominal stimulation activated the phasic flexor muscles in the rostral 5 abdominal segments and their homologs in the 6th segment, the posterior telson flexor muscles. Nearly one-quarter of cord-transected animals responded to the stimuli with phasic flexor muscle activity by one week after the lesion, and almost 90% were responsive by 3 weeks. 3. Regeneration of axons across the lesion played little or no role in the recovery of phasic flexor muscle responsiveness. In addition, the lateral giant axons were not activated by the gradually applied stimuli that triggered phasic flexor muscle contractions. These results suggest that non-giant pathways confined to the abdominal nervous system become functional following chronic cord transection. 4. Retransection of the nerve cord below the original lesion showed that smaller subsets of the abdominal cord, including a single ganglion, could develop the ability to generate phasic flexor muscle contractions in response to gradually applied stimuli. 5. Phasic flexor motoneurons in cord-transected animals could be excited by stimulation of afferents throughout the abdomen. The sensory pathways producing this activation appear to project through the nerve cord without much cross-over between left and right sides. |
| Databáze: | OpenAIRE |
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