After-effects of fusimotor stimulation on spindle la afferents' dynamic sensitivity, revealed during slow movements.
After-effects of fusimotor action on dynamic sensitivity of spindle primary afferents from soleus resulted from low rate stimulation of both static and dynamic gamma-axons. Sensitivity to small sinusoidal stretches superimposed on triangles was enhanced during triangular lengthening but not during shortening. These after-effects were elicited by fusimotor stimulation during preceding triangular shortening, but not during lengthening. Given these characteristics, they may be important functionally during alternating rhythmic movements.
D000344:Afferent Pathways / Q000502:physiology; D000818:Animals; D002415:Cats; D006614:Hindlimb / Q000294:innervation; D008465:Mechanoreceptors / Q000502:physiology; D009043:Motor Activity / Q000502:physiology*; D009046:Motor Neurons / Q000502:physiology*; D009047:Motor Neurons, Gamma / Q000502:physiology*; D009119:Muscle Contraction; D009470:Muscle Spindles / Q000502:physiology*; D009132:Muscles / Q000294:innervation*; D012026:Reflex, Stretch