Fig 1.
Location of CSv (yellow patches highlighted by white circles) overlaid on the sagittal (left), coronal (middle), and axial (right) sections of one representative subject (S1).
See S1 Fig for other subjects.
Fig 2.
Manually delineated waypoint ROIs used to identify five of the major white matter tracts analysed in this study, superimposed on a coronal section of the T1-weighted image of one representative subject (S1).
The coloured areas depict ROIs for the five tracts (cyan, SLF I; blue, SLF II; purple, SLF III; green, cingulum; yellow, callosal fibres). AC: anterior commissure, cgs: cingulate sulcus, sfs: superior frontal sulcus, iprs: inferior precentral sulcus, lf: lateral fissure, SLF: superior longitudinal fasciculus.
Fig 3.
Position of CSv (yellow) with respect to the PDD map of dMRI data on a representative coronal section of four subjects (S1-S4).
The colour scheme depicts the PDD in each voxel (blue, superior-inferior; green anterior-posterior; red, left-right). CSv is adjacent to the cingulum (highlighted by white solid lines), which can be seen as a group of voxels located inferior to the cingulate sulcus with the anterior-posterior diffusion direction.
Fig 4.
CSv streamlines in the left hemisphere of one representative subject (S1).
Left CSv (yellow) identified by fMRI is shown together with streamlines (light grey) terminating near CSv. CSv and streamlines are overlaid on the sagittal (left), coronal (middle), and axial (right) sections of T1-weighted image. See S3 Fig for CSv streamlines which were not categorised into major white matter tracts.
Fig 5.
CSv streamlines which were categorised into major white matter tracts; SLF I (red), the cingulum (green), and the callosal fibres (blue), in the left (left column) and right (right column) hemispheres of four subjects (S1-S4).
CSv (yellow) identified based on fMRI data is shown with the streamlines in each hemisphere. CSv and streamlines are overlaid on a sagittal section medial to CSv and streamlines. Note that CSv is not fully visible in every image as it is located medially to some of the streamlines.
Fig 6.
Summary statistics of the proportion of CSv streamlines belonging to each of the major white matter tracts considered in the left (blue) and right (yellow) hemispheres.
CSv streamlines belonging to SLF I and the cingulum together accounted for approximately 18% of all CSv streamlines. Error bars depict ±1 SEM across subjects. SLF: superior longitudinal fasciculus, AF: arcuate fasciculus, CST: corticospinal tract.