Convergence of Large Muscle Spindle (Ia) Afferents at Interneuronal Level in the Reciprocal Ia Inhibitory Pathway to Motoneurones

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Abstract
It has earlier been established that in a number of motor nuclei la inhibition can be evoked from several muscles. It has now been investigated if this convergence takes place already at the interneuronal level or if the la inhibition from the different muscles is exerted through separate interneuronal pools which then converge at motoneuronal level. With intracellular recording from motoneurones and utilizing the technique of spatial facilitation it has been demonstrated that when activity in la afferents from several muscles can evoke inhibition in a given motoneurone a convergence of these la afferents does occur onto common interneurones.