WHITE MATTER OF CEREBRUM
White matter of cerebrum
types of fibers in the white matter
association fibers ( intra hemispheric fibres)
features
interconnect different regions of same cerebral hemisphere
types
short association fibers ( arcuate or U fibers )
long association fibers
connect gyri of different lobes
types
uncinate fasciculus
connects motor speech area and orbital cortex of frontal lobe
to cortex of temporal lobe
cingulum or limbic association bundle
thick fibers occupying cingulate and parahippocampal gyri
extends from parater-minal gyrus to uncus
forming almost a circle like a girdle
superior longitudinal bundle
longest association bundle
connects frontal lobe to
occipital and temporal lobes
inferior longitudinal bundle
connects visual association area to
temporal lobe
fronto-occipital bundle
commences in frontal pole
runs backwards to radiate in occipital and temporal lobes
commissural fibers ( interhemispheric fibres )
Corpus callosum
Anterior commissure
Posterior commissure
Hippocampal commissure
Habenular Commissure
projection fibers
connect cerebral cortex to subcortical centres
types
corticofugal fibers
go away from cortex ( cortical efferents )
corticopetal fibers
come to cerebral cortex from other centres
types
present in neocortex
corona radiata
Internal capsule
present in allocortex
fimbria
fornix