Document Detail

Sensory regulation of network components underlying ciliary locomotion in Hermissenda.
MedLine Citation:
PMID:  18768639     Owner:  NLM     Status:  MEDLINE    
Ciliary locomotion in the nudibranch mollusk Hermissenda is modulated by the visual and graviceptive systems. Components of the neural network mediating ciliary locomotion have been identified including aggregates of polysensory interneurons that receive monosynaptic input from identified photoreceptors and efferent neurons that activate cilia. Illumination produces an inhibition of type I(i) (off-cell) spike activity, excitation of type I(e) (on-cell) spike activity, decreased spike activity in type III(i) inhibitory interneurons, and increased spike activity of ciliary efferent neurons. Here we show that pairs of type I(i) interneurons and pairs of type I(e) interneurons are electrically coupled. Neither electrical coupling or synaptic connections were observed between I(e) and I(i) interneurons. Coupling is effective in synchronizing dark-adapted spontaneous firing between pairs of I(e) and pairs of I(i) interneurons. Out-of-phase burst activity, occasionally observed in dark-adapted and light-adapted pairs of I(e) and I(i) interneurons, suggests that they receive synaptic input from a common presynaptic source or sources. Rhythmic activity is typically not a characteristic of dark-adapted, light-adapted, or light-evoked firing of type I interneurons. However, burst activity in I(e) and I(i) interneurons may be elicited by electrical stimulation of pedal nerves or generated at the offset of light. Our results indicate that type I interneurons can support the generation of both rhythmic activity and changes in tonic firing depending on sensory input. This suggests that the neural network supporting ciliary locomotion may be multifunctional. However, consistent with the nonmuscular and nonrhythmic characteristics of visually modulated ciliary locomotion, type I interneurons exhibit changes in tonic activity evoked by illumination.
Terry Crow; Lian-Ming Tian
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2008-09-03
Journal Detail:
Title:  Journal of neurophysiology     Volume:  100     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-11-12     Completed Date:  2009-04-20     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2496-506     Citation Subset:  IM    
Dept. of Neurobiology and Anatomy, Univ. of Texas Medical School, 6431 Fannin St., Houston, TX 77030, USA.
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MeSH Terms
Action Potentials / physiology,  radiation effects
Electric Stimulation / methods
Gap Junctions / physiology
Hermissenda / physiology*
Locomotion / physiology*
Models, Neurological
Nerve Net / cytology,  physiology*
Photic Stimulation / methods
Reaction Time / physiology
Sensory Receptor Cells / cytology,  physiology*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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