Standard Article

Muscle Spindles: Their Messages and Their Fusimotor Supply

Handbook of Physiology, The Nervous System, Motor Control

  1. Peter B. C. Matthews

Published Online: 1 JAN 2011

DOI: 10.1002/cphy.cp010206

Comprehensive Physiology

Comprehensive Physiology

How to Cite

Matthews, P. B. C. 2011. Muscle Spindles: Their Messages and Their Fusimotor Supply. Comprehensive Physiology. 189–228.

Author Information

  1. University Laboratory of Physiology, Oxford, England

Publication History

  1. Published Online: 1 JAN 2011

Abstract

The sections in this article are:

  • 1
    Tendon Organs
  • 2
    Structure of Muscle Spindles
    • 2.1
      Classic View
    • 2.2
      Recognition of Motor Duality
    • 2.3
      Subdivision of Nuclear-Bag Fibers
  • 3
    Functional Properties of Primary and Secondary Spindle Afferent Endings
    • 3.1
      Different Responses to Various Stimuli
    • 3.2
      Mode of Summation of Signal Components
    • 3.3
      Amplitude Nonlinearity
    • 3.4
      Linear Responses to Sinusoidal Stretching
    • 3.5
      Assessment
    • 3.6
      Possible Intermediate Endings
  • 4
    Motor Supply to Muscle Spindle
    • 4.1
      Gamma Motor Axons
    • 4.2
      Delimitation of Static and Dynamic Fusimotor Axons
    • 4.3
      Intrafusal Destination of Static and Dynamic Axons
    • 4.4
      Properties of Intrafusal Muscle Fibers
    • 4.5
      Beta or Skeletofusimotor Axons
  • 5
    Possible Functional Roles for the Fusimotor System
    • 5.1
      Maintenance of Sensitivity
    • 5.2
      Central Regulation of Spindle Sensitivity (Parameter Control)
    • 5.3
      Fusimotor Biasing and Suggested Role as Servo Input
    • 5.4
      Assessment
  • 6
    Summary
    • 6.1
      Structure
    • 6.2
      Functional Differences Between Primary and Secondary Endings
    • 6.3
      Static and Dynamic Fusimotor Axons
    • 6.4
      Possible Functional Roles for the Fusimotor System