The dorsal spino-olivocerebellar system in the cat |
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Authors: | C -F Ekerot Dr B Larson |
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Institution: | (1) Institute of Physiology, University of Lund, Sölvegatan 19, S-223 62 Lund, Sweden |
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Abstract: | Summary The spino-olivocerebellar paths ascending through the dorsal funiculi (DF-SOCPs) were studied by recording climbing fiber field potentials in the cerebellar cortex. Several DF-SOCPs were identified on the basis of their response latencies, peripheral inputs, and projection areas. The projection areas consist of eight sagittal zones on each side of the anterior lobe denoted a, x, b, C1, c2, c3, d1, and d2. The a and b zones, which are activated exclusively from hindlimb nerves (Oscarsson, 1969a) were not studied.The shortest response latencies in the x, c1, c3 and d2 zones indicate that these zones are activated by direct paths between the dorsal funiculus nuclei and the inferior olive. These zones also have long latency responses evoked through indirect paths. The direct paths are activated from the flexor reflex afferents and the indirect paths from distal cutaneous afferents. The x zone is activated from forelimb nerves only. The c1 and c3 zones and presumably also the d2 zone are activated from hindlimb and forelimb nerves and have a detailed somatotopical organization.The c2 and d1 zones have long latency responses evoked through indirect paths. Both zones are activated from distal cutaneous afferents. The c2 zone has no distinct somatotopical organization, whereas the d1 zone has largely separate forelimb and hindlimb areas. In contrast to all other zones, the c2 zone is activated not only from ipsilateral but also from contralateral nerves. |
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Keywords: | Dorsal spino-olivocerebellar paths Climbing fibers Inferior olive Sagittal organization |
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