Projection, Association and
Commissural Fibres
When a considerable number of fibres
pass from a mass of grey matter in one part of the brain to another mass of
grey matter in another part of the brain or spinal cord these are referred to
as projection
fibres. Fibres interconnecting different areas of the cerebral cortex
or of the cerebellarcortex are called association fibres, while fibres
connecting identical areas of the two halves of the brain are called commissural
fibres.
All fibres crossing
from one side of the brain or spinal cord to the opposite side are not
commissural. When fibres originating in a mass of grey matter in one half of
the CNS end in some other mass of grey matter in the opposite half they are
referred to as decussating fibres, and the sites where such crossings take
place are referred to as decussations.
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