Electrophysiological studies on gamma motoneurones.

Eccles, J. C., R. M. Eccles, A. Iggo and A. Lundberg. Electsophysiological studies on gamma motoneurones. Gamma motoneurones supplying the muscle spindles of limb muscles of cats have been investigated by microelectrodes either extracellular or intracellular, and shown to lie interspersed with the alpha motoneurones of that muscle. The spike potential of the gamma motoneurones resembles that of alpha motoneurones both in having an -IS–SD composition and in being followed by a long after-hyperpolarization. When activated either by repetitive antidromic impulses, or by a prolonged depolarizing current, the gamma motoneurones give some spike potentials at much higher frequencies than the alpha. It was confirmed that the gamma motoneurones differ from the alpha in receiving no monosynaptic excitatory action, but there are polysynaptic excitatory and inhibitory actions from other afferents.

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