Functional Organization of the Dorsal Spino‐Cerebellar Tract in the Cat

Recording was made from fibres in the dorsal spino‐cerebellar tract activated by group I afferents from soleus. Adequate activation through brief stretches giving selective activation of I a or I b afferents was used to differentiate between units activated by I a and I b afferents. There was no evidence of convergence of excitatory action by I a and I b afferents to the same neurones. The receptive field is often larger for neurones activated by spindle than for neurones activated by tendon organ afferents.