Morphological patterns and spatial probability maps of two defining sulci of the posterior ventrolateral frontal cortex of the human brain: the sulcus diagonalis and the anterior ascending ramus of the lateral fissure

Brain Structure & Function
Trisanna Sprung-Much, Michael Petrides

Abstract

The sulcus diagonalis (ds) and the anterior ascending ramus of the lateral fissure (aalf) are two defining sulci of the posterior ventrolateral frontal cortex, which is also known as the anterior language region in the language dominant hemisphere. The aalf extends dorsally from the lateral fissure, separating the pars opercularis from the pars triangularis of the inferior frontal gyrus. The ds, which is a relatively vertical sulcus, is found within the pars opercularis. Given the proximity and similar orientation of these two sulci, it can be difficult to identify them properly. The present study provides a means of differentiating these two sulci accurately using magnetic resonance imaging (MRI). Voxels within the ds and the aalf were labeled in 40 in vivo MRI volumes (1.5 T) that had been linearly registered to the Montreal Neurological Institute stereotaxic space to examine the morphological patterns of these two sulci and classify these patterns based on relations with neighboring sulci. The morphological variability and spatial extent of each sulcus was then quantified in the form of volumetric and surface spatial probability maps. The ds, a rather superficial sulcus, could be identified in 51.25% of hemispheres. The aalf...Continue Reading

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Citations

Oct 5, 2019·Brain Topography·Jean-François ManginZhong Yi Sun
Nov 2, 2019·Cerebral Cortex·Trisanna Sprung-Much, Michael Petrides
Dec 24, 2020·Brain Structure & Function·Nicole EichertMichael Petrides
Mar 21, 2021·Brain Structure & Function·Lazaros C Triarhou
Jun 6, 2021·NeuroImage·Léonie BorneJean-François Mangin
Aug 15, 2021·Brain Structure & Function·Trisanna Sprung-MuchMichael Petrides
Dec 29, 2021·Cerebral Cortex·Veronika ZlatkinaMichael Petrides

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Methods Mentioned

BETA
imaging technique

Software Mentioned

fsaverage
SPSS Statistics
SPSS
FreeSurfer
Adobe Photoshop
Adobe Illustrator (
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