Stretch-induced contraction of intrafusal muscle in cat muscle spindle.
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.
D000344:Afferent Pathways / Q000502:physiology; D000818:Animals; D002415:Cats; D005071:Evoked Potentials; D066298:In Vitro Techniques; D008722:Methods; D009119:Muscle Contraction; D009132:Muscles / Q000294:innervation* / Q000502:physiology