Neurosurgery notes/Anatomy/White matter tracts/Association fibres/Frontal aslant tract

Frontal aslant tract

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Parent item
Association fibres

General

  • A vertically-oblique directed tract

Connection

  • SMA + Motor areas → inferior frontal gyrus

Relations

  • Superficial: horizontal segment of the longitudinal gyrus

Function

  • Speech initiation
  • Control of pars Opercularis by preSMA

Deficit

  • Speech arrest
  • Stuttering

Images

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(A) Connections of the premotor regions of the frontal lobe. The frontal aslant tract (FAT) (yellow) connects the (B) dorsal and medial (supplementary and pre-supplementary motor area, SMA and pre-SMA) cortex of the SFG with the (C) posterior region of IFG. Red U-shaped tracts connect the superior and middle frontal gyri and the inferior and middle frontal gyri. Blue projection fibres connect the cortical premotor regions with the head of the caudate nucleus. (D) The frontal aslant is a bilateral tract.
(A) Connections of the premotor regions of the frontal lobe. The frontal aslant tract (FAT) (yellow) connects the (B) dorsal and medial (supplementary and pre-supplementary motor area, SMA and pre-SMA) cortex of the SFG with the (C) posterior region of IFG. Red U-shaped tracts connect the superior and middle frontal gyri and the inferior and middle frontal gyri. Blue projection fibres connect the cortical premotor regions with the head of the caudate nucleus. (D) The frontal aslant is a bilateral tract.
 
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A) Surface anatomy B) cytoarchitectonic areas (according to Brodmann, 1909) of the frontal lobe. AOF, anterior orbitofrontal gyrus; GR, gyrus rectus; IFGop, inferior frontal gyrus pars opercularis; IFGor, inferior frontal gyrus pars orbitalis; IFGtr, inferior frontal gyrus pars triangularis; LOF, lateral orbitofrontal gyrus; MOF, medial orbitofrontal gyrus; OG, olfactory gyrus; POF, posterior orbitofrontal gyrus; SFG, superior frontal gyrus; SuCG, subcentral gyrus.
A) Surface anatomy
B) cytoarchitectonic areas (according to Brodmann, 1909) of the frontal lobe.
AOF, anterior orbitofrontal gyrus; GR, gyrus rectus; IFGop, inferior frontal gyrus pars opercularis; IFGor, inferior frontal gyrus pars orbitalis; IFGtr, inferior frontal gyrus pars triangularis; LOF, lateral orbitofrontal gyrus; MOF, medial orbitofrontal gyrus; OG, olfactory gyrus; POF, posterior orbitofrontal gyrus; SFG, superior frontal gyrus; SuCG, subcentral gyrus.
Coronal slices of the 'Digital Dejerine' maps and post-mortem blunt dissections of the corresponding tracts. (A) Fronto-parietal U-tracts of the hand region connecting precentral gyrus (PrCG) with post-central gyrus (PoCG). The asterisks in the top left images indicate the correspondence between the presence of protuberances from the wall of the central sulcus and the underlying U-shaped tract. (B) U-shaped tracts connecting the PrCG with superior frontal gyrus (SFG). (C) Connections between the middle frontal gyrus (MFG) and inferior frontal gyrus (IFG). (D) Fronto-insular connections. (E) The frontal aslant tract (FAT) connecting inferior and superior frontal gyri.
Coronal slices of the 'Digital Dejerine' maps and post-mortem blunt dissections of the corresponding tracts. (A) Fronto-parietal U-tracts of the hand region connecting precentral gyrus (PrCG) with post-central gyrus (PoCG). The asterisks in the top left images indicate the correspondence between the presence of protuberances from the wall of the central sulcus and the underlying U-shaped tract. (B) U-shaped tracts connecting the PrCG with superior frontal gyrus (SFG). (C) Connections between the middle frontal gyrus (MFG) and inferior frontal gyrus (IFG). (D) Fronto-insular connections. (E) The frontal aslant tract (FAT) connecting inferior and superior frontal gyri.