Anatomy (CNS) · MU Sofia

166. Myeloarchitectonics of the telencephalon. Corpus callosum. Commissurae. Capsula interna.

Covers the three classes of cerebral white matter: association fibres, including short arcuate fibres and the named long bundles such as the superior longitudinal, uncinate and cingulum; commissural fibres, with the corpus callosum divided into rostrum, genu, body, tapetum and splenium; and projection fibres forming the corona radiata and internal capsule. The internal capsule is described as V-shaped with its anterior, posterior, genu and retro- and sub-lentiform parts, each linked to the fibre tracts that pass through them.

Inside: 4 sections · 7 labelled pictures · 10 flashcards · 4 min

Topic 23 of 34 in the MU Sofia syllabus for Anatomy (CNS) (Medicine, Year 2). The free AceMed note covers it in 4 sections, about 514 words (4 min of reading), with 10 flashcards.

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  1. 166 WHITE MATTER OF HEMISPHERIS
  2. Association fibers :
  3. Commissural fibers :
  4. Projection fibers :

166 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. Commisural 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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