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 )
- 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
- present in allocortex
- fimbria
Discussion