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Synaptic effects from chemically activated fine muscle afferents upon alpha moto neurons in de cerebrate and spinal cats


, : Synaptic effects from chemically activated fine muscle afferents upon alpha moto neurons in de cerebrate and spinal cats. Brain Research 206(2): 361-370

In spinal and decerebrate cats fine muscle afferents (group III and IV) were selectively activated by intra-arterial injection of bradykinin and KCl into the gastrocnemius-soleus muscle. The synaptic responses induced in lumbar .alpha.-motoneurons by fine muscle afferents were examined without interference of effects from large afferents. .alpha.-Motoneurons receiving EPSP [excitatory postsynaptic potential] evoked by electrical stimulation of cutaneous and high threshold muscle afferents (mainly flexor motoneurons) responded to the activation of fine muscle afferents with a depolarization of their membrane and an increase in synaptic noise. Motoneurons in which IPSP [inhibitory postsynaptic potential] were evoked by electrical stimulation of cutaneous and high threshold muscle afferents (mainly extensor motoneurons) responded with hyperpolarization of their membrane. Cells with mixed excitatory-inhibitory electrically induced response characteristic responded with an increase in synaptic noise without substantial change in the level of their membrane potential to chemical stimulation of fine muscle afferents. A function of group III and IV muscle afferents is to participate in the complex reflex control performed by the flexor reflex system.

US$29.90

PMID: 7214139


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