Journal of Neuroscience, Vol 1, 1069-1074, Copyright © 1981 by Society for Neuroscience
Stretch-induced contraction of intrafusal muscle in cat muscle spindle
RE Poppele and DC Quick
Measurements of tension, stiffness, and sarcomere length of intrafusal
muscle during ramp stretch of isolated muscle spindles have revealed a
stretch-induced contraction of the bag1 fiber. This behavior can account
for the very high sensitivity of primary endings to stretch as well as the
enhanced sensitivity evoked by dynamic fusimotor stimulation.