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Oligosynaptic excitation of motoneurones by impulses in group Ia muscle spindle afferents in the cat

1. Intracellular recording from hind‐limb motoneurones was used to investigate whether di‐ and trisynaptic (oligosynaptic) excitatory post‐synaptic potentials (e.p.s.p.s) are evoked from group Ia muscle spindle afferents in those motoneurones in which such potentials are evoked from Ib tendon organ afferents or entire group I afferents. Ia afferents of triceps surae and plantaris were activated either selectively by single brief stretches of these muscles, or together with Ib afferents by electrical stimuli applied to the nerves.