Anatomy Bones and Muscles · MU Pleven

139. Systems of fibres in the white matter of the telencephalon. Internal capsule.

Covers the three groups of white matter fibres in the cerebral hemispheres: association fibres, including arcuate fibres and the named long fasciculi, commissural fibres led by the corpus callosum and its parts, and projection fibres forming the corona radiata and internal capsule. Its account of the internal capsule describes the anterior, posterior and genu regions and the retro-lentiform and sub-lentiform parts, with their fibre tracts listed for each.

Inside: 4 sections · 5 labelled pictures · 15 flashcards · 4 min

Topic 138 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 4 sections, about 519 words (4 min of reading), with 15 flashcards.

In this note

  1. WHITE MATTER OF HEMISPHERIS
  2. Association fibers :
  3. Commissural fibers :
  4. Projection fibers :

WHITE MATTER OF HEMISPHERIS

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  • Telencephalon consists of : - cerebral cortex (grey matter)
  • white matter
  • Basal ganglia
  • White matter of the cerebral cortex consists of 3 types of fibers
  1. 1. Association fibers:
  • These are fibers that connect different regions in the same hemisphere.
  • They are either short (arcuate fibers) or long (fasciculi).
  1. 2. Commissural fibers :
  • These are fibers that interconnect and permit communication between both hemispheres.
  • They include corpus callosum and other commissures (anterior commissure, posterior commissure.... etc.)
  1. 3. Projection fibers :
  • These are fibers that link the cerebral cortex to the diencephalon, brain stem, cerebellum, and spinal cord.
  • These fibers are either ascending or descending.
  • They form the corona radiata and internal capsule.

Association fibers :

  • Short fibers: they are called arcuate fibers as they curve in an arc to pass from a gyrus to another.
  • Long fibers: they are arranged as discrete bundles or fasciculi. They include:
  • Superior longitudinal bundle: connecting frontal lobe to occipital and temporal lobes.
  • Fronto-occipital bundle: connecting also frontal lobe to occipital and temporal lobes (but runs at a deeper plane than superior longitudinal bundle). It is considered as a part from superior longitudinal bundle separated from it by the corona radiata.
  • Inferior longitudinal bundle: connecting frontal lobe to temporal lobe.
  • Uncinate bundle: connecting sensory speech area (in the temporal lobe) to motor speech area (in the frontal lobe).
  • Cingulum: connecting cingulate gyrus to the para-hippocampal gyrus. It runs deep to the limbic lobe.

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