Abstract
Monosynaptic reflexes from lumbosacral segments of the cat spinal cord have been measured 1–7 weeks after unilateral tenotomy of hind-limb muscles. Previous findings of increased reflexes from stimulation of nerves from tenotomized muscles have been confirmed. Studies of heterosynaptic reflexes indicate that the changes are due to increased synaptic effectiveness of the afferent fibers rather than to changes in motoneuron excitability. Since the maximum potentiated reflex is not increased after tenotomy, it appears that no new connections to motoneurons are established by the afferent fibers from the tenotomized muscles. The percentage reflex depression produced by low frequency activation of the reflexes is unchanged by tenotomy. We interpret this to indicate that the total transmitter pool that these fibers have available is increased, since a change in the fractional release of transmitter would not by itself explain this finding.
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