Fusimotor Induced Phase Differences Between Responses of Primary and Secondary Endings from the Same Muscle Spindle
The work presented in this report forms part of a larger research programme in which the behaviour of the muscle spindle is described under conditions when several fusimotor inputs, and length changes are applied simultaneously to the spindle while recording simultaneously from its primary (Ia) and secondary (II) sensory endings. We restrict the current presentation to a discussion of the strength of coupling or association and time delay between the responses of primary and secondary endings from the same tenuissimus muscle spindle during activation of single and multiple fusimotor inputs. A description of this interaction is particularly interesting in the light of a recent study by Edgley and Jankowska (1987) which demonstrated the convergence of group Ia and II afferent axons onto the same interneurones in the midlumbar segment of the spinal cord.
KeywordsSpike Train Muscle Spindle Ventral Root Phase Lead Sensory Axon
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