Document Detail

The spatial distribution and functional properties of type I mechanoreceptor units of the sural nerve of the rabbit.
MedLine Citation:
PMID:  7059845     Owner:  NLM     Status:  MEDLINE    
The functional characteristics and spatial arrangement of Type I mechanosensitive units found in the sural nerve of the anaesthetized rabbit have been investigated. There are approximately 108 Type I units innervating a skin area of about 59.1 cm2 supplied by the sural nerve giving an innervation density of 1.83. This innervation density of 1.83 does not vary over the skin territory innervated by the sural. The dome/fibre ratio was 2.7. The domes were found to be distributed in a dispersed but fairly regular pattern. The average nearest neighbour distance was 5.3 mm. A stimulus of 5.5 threshold units showed the existence of a small receptive field of radius 2 mm surrounding each dome; at a 3 mm radius even the largest 2 mm indentation failed to evoke a response. The response of the Type I units exhibited 4 distinct phases: (1) a dynamic phase; (2) a transient adaptive phase; (3) a highly irregular static phase; (4) an off phase. The impulse frequency/static displacement relationship was best fitted by a power function. The impulse frequency-velocity characteristic became horizontal at an average value of 15 micrometers/ms. A power function provided the best fit for this relationship. The possible physiological significance of the differences between properties of Type I receptor populations in the rabbit and cat are discussed.
S C Aitken; S Lal
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Brain research     Volume:  257     ISSN:  0006-8993     ISO Abbreviation:  Brain Res.     Publication Date:  1982 Mar 
Date Detail:
Created Date:  1982-05-12     Completed Date:  1982-05-12     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0045503     Medline TA:  Brain Res     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  45-56     Citation Subset:  IM; S    
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MeSH Terms
Electric Stimulation
Evoked Potentials, Somatosensory
Mechanoreceptors / anatomy & histology,  physiology*
Neural Conduction
Sensory Thresholds
Skin / innervation
Spinal Nerves / physiology*
Sural Nerve / anatomy & histology,  physiology*
Touch / physiology

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

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