Journal article
Separation and estimation of muscle spindle and tension receptor populations by vibration of the biceps muscle in the frog
Archives italiennes de biologie, v 140(4)
Oct 2002
PMID: 12228981
Abstract
Frog spinal cord reflex behaviors have been used to test the idea of spinal primitives. We have suggested a significant role for proprioception in regulation of primitives. However the in vivo behavior of spindle and golgi tendon receptors in frogs in response to vibration are not well described and the proportions of these proprioceptors are not established. In this study, we examine the selectivity of muscle vibration in the spinal frog. The aim of the study was (1) to examine how hindlimb muscle spindles and GTO receptors are activated by muscle vibration and (2) to estimate the relative numbers of GTO receptors and spindle afferents in a selected muscle, for comparison with the mammal. Single muscle afferents from the biceps muscle were identified in the dorsal roots. These were tested in response to biceps vibration, intramuscular stimulation and biceps nerve stimulation. Biceps units were categorized into two types: First, spindle afferents which had a high conduction velocity (approximately 20-30 m/s), responded reliably (were entrained 1:1) to muscle vibration, and exhibited distinct pauses to shortening muscle contractions. Second, golgi tendon organ afferents, which had a lower conduction velocity (approximately 10-20 m/s), responded less reliably to muscle vibration at physiologic muscle lengths, but responded more reliably at extended lengths or with background muscle contraction, and exhibited distinct bursts to shortening muscle contractions. Vibration responses of these units were tested with and without muscle curarization. Ensemble (suction electrode) recordings from the dorsal roots were used to provide rough estimates of the proportions of the two muscle afferent types.
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Details
- Title
- Separation and estimation of muscle spindle and tension receptor populations by vibration of the biceps muscle in the frog
- Creators
- S F Giszter - Departments of Neurobiology and Anatomy, MCP Hahnemann University, 2900 Queen Lane, Philadelphia, PA 19129, USA. simon@swampthing.neurobio.mcphu.eduW J Kargo
- Publication Details
- Archives italiennes de biologie, v 140(4)
- Publisher
- Italy
- Grant note
- R29 NS034640-06 / NINDS NIH HHS NS34640 / NINDS NIH HHS R01 NS040412 / NINDS NIH HHS R01 NS040412-01A1 / NINDS NIH HHS NS40412-01A1 / NINDS NIH HHS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Neurobiology and Anatomy
- Web of Science ID
- WOS:000177720800003
- Scopus ID
- 2-s2.0-0035992980
- Other Identifier
- 991014878261404721
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- Neurosciences