Activities of mesencephalic nucleus neurons during fictive swimming of the carp Cyprinus carpio.
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- BABA YOSHIHIKO
- Laboratory of Fish Physiology, Graduate School of Biosphere Sciences, Hiroshima University
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- KAKE YASUYUKI
- Laboratory of Fish Physiology, Graduate School of Biosphere Sciences, Hiroshima University
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- YOSHIDA MASAYUKI
- Laboratory of Fish Physiology, Graduate School of Biosphere Sciences, Hiroshima University
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- UEMATSU KAZUMASA
- Laboratory of Fish Physiology, Graduate School of Biosphere Sciences, Hiroshima University
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Fish swim by undulatory contractions of the axial trunk musculature. It has been presumed that a descending signal from the brainstem activates central pattern generators in the spinal cord to make the swimming rhythm. In the carp the electrical or chemical stimulation of a mesencephalic nucleus, the nucleus fasciculi longitudinalis medialis (Nflm), could initiate swimming. However, it has not been established what signals originate from the Nflm in order to make the fish swim. The activity of the Nflm neurons was therefore examined electrophysiologically during fictive swimming in paralyzed carp. Three types of neuronal activities closely related to the swimming rhythms were obtained. The first type was a continuous tonic firing throughout an episode of fictive swimming. Neurons involved in this tonic activity may project to the spinal cord and contribute to the activation of spinal neurons to initiate fish swimming. The second type was accompanied by continual phasic firings occurring in rhythm with the activity of spinal motoneurons. Supposing that the swimming rhythm originates in the spinal cord, the synchronous activity in the brain neurons may suggest that in the nucleus there is a relay neuron conveying the rhythm information from the cord to other neurons there or in the brain. The third type exhibited reduced firing rates during fictive swimming. It is possible that the neurons engaged in this activity may be inhibitory and suppress the activities of other neurons in the nucleus and spinal cord during rest or during decelerating swimming.
収録刊行物
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- Fisheries science
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Fisheries science 69 (3), 581-588, 2003
公益社団法人 日本水産学会
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詳細情報 詳細情報について
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- CRID
- 1390282679406694912
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- NII論文ID
- 130003742852
- 30014678032
- 80016079562
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- NII書誌ID
- AA10993718
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- COI
- 1:CAS:528:DC%2BD3sXltlWjurY%3D
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- ISSN
- 14442906
- 09199268
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- NDL書誌ID
- 6570860
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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