Zones
Zones
Olivocereb
DSCT/CCT
Ponto
(motor)
Ponto
(pariet)
Problems
Contents
Anatomy
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Zones of the Cerebellum and
Distribution of Fibers
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The various cerebellar
afferents that we have learned distribute to different zones
of the cerebellum. Four different zones need to be
considered. These are the 1) medial zone, 2)
intermediate zone, 3) lateral zone and 4)
flocculonodular zone (or lobe). Let's consider the
pathways that end in each zone or lobe.
- olivocerebellar fibers--distribute to the
ENTIRE cerebellum
- cuneocerebellar fibers--distribute to the
medial and intermediate zones
- dorsal spinocerebellar fibers--distribute to
the medial and intermediate zones
- pontocerebellar fibers--distribute to the
intermediate and lateral zones
A. Those pontine grey neurons that project to the
intermediate zone of the cerebellum receive
their corticopontine input from the primary
motor cortex (area 4).
B. Those pontine grey neurons that project to the
lateral zone of the cerebellum receive their
corticopontine input from posterior parietal
cortex (area 6). In comparison with the primary motor
cortex, posterior parietal cortex is more involved in
planning the motor act than in execution
of the program.
- vestibulocerebellar fibers--(arise from the
vestibular ganglion and nuclei) distribute primarily to
the flocculonodular lobe
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