In fact, results from previous research suggest a linear relationship between the rate of muscle spindle
discharge and muscle temperature.
Alterations not only in muscle chemistry, but also in sensitivity of the muscle spindle
(the muscle's sensory organ), have important consequences beyond the peripheral level.
In an effort to avoid injury, the nervous system monitors the intensity of a stretch with receptors called muscle spindle
fibers, located within the muscle itself.
Thin filaments from the cut proximal dorsal rootlets were teased apart until muscle spindle
activity from a single neuron with the most sensitive part of its receptive field being in the low back could be identified.
In muscle spindle
receptors, sensitivity to stretch can be adjusted, by means of small (gamma-size) motor neurons that carry messages from the CNS to the spindle.
The rat tongue muscle spindle
has also been studied (Smith, 1989).
When the receptor areas of the muscle spindle
are stretched, impulses transmitted by its sensory endings increase in number almost directly in proportion to the degree of stretch and continue for many minutes.
3, 4, 22) Cervical suboccipital muscles are richly innervated and contain relatively high muscle spindle
Earlier studies by Burke and others (1976) have shown that the TVR is primarily attributable to muscle spindle
Ia fibers, which are able to respond one-to-one to vibration frequencies of up to 200 Hz.
primary endings (type Ia fibres) are sensitive to tendon vibration.
2009) where excitatory responses of the muscle spindle
are speculated to play a role in enhancing muscle activation, involving a spinal reflex mechanism.
On the spinal level, botulinum toxin is capable of producing reflex inhibition of the muscle spindle