Document Detail

Primitive nervous systems: electrophysiology of the pharynx of the polyclad flatworm, Enchiridium punctatum.
MedLine Citation:
PMID:  1018166     Owner:  NLM     Status:  MEDLINE    
1. Electrical activity accompanying motor activity can be recorded from the excised pharynx of Enchiridium punctatum. Multiple stimuli elicit behaviour which consists of an initial aperture closure followed by extension and then peristalsis. If the stimulus parameters are increased the preparation bends from side to side instead of proceeding through the behavioural sequence. Bending appears to inhibit other movements differentially. 2. The conduction involved with peristalsis is polarized and proceeds in a proximal direction. 3. With stimulus intensities greater than those needed to produce the behavioural response an initial muscle potential (IMP) is evoked. The IMP is frequency sensitive. Maximum facilitation occurs within 100 ms and drops to 50% of maximum within 250 ms. 4. Conduction velocities of the IMP range from 0-05 m s-1 to 1-9 m s-1. Conduction velocities appear to increase with facilitation.
G Stone; H Koopowitz
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  65     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  1976 Dec 
Date Detail:
Created Date:  1977-04-25     Completed Date:  1977-04-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  627-42     Citation Subset:  IM    
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MeSH Terms
Electric Stimulation
Magnesium / pharmacology
Membrane Potentials* / drug effects
Muscle Contraction*
Muscles / physiology
Neural Conduction
Neural Inhibition
Pharynx / innervation,  physiology
Time Factors
Turbellaria / physiology*
Reg. No./Substance:

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

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