Hodos NETWORKS & TRACTS

Lesion lab · Group reference

Where a lesion sits decides what it disconnects.

Drag the sphere through the white matter. Every sampled streamline that passes through it is drawn along its whole length, so you can see which regions it runs between. The panel lists the bundles it cuts and what the author’s teaching notes say injury to each causes, quoted verbatim.

Loading reference anatomy…

Left hemisphere
Lateral view

Drag the sphere to move it across the screen; drag anywhere else to rotate, and pinch or scroll to zoom. Rotate the view, or use the position sliders, to move it along the third axis. With the canvas focused, arrow keys rotate, Shift + arrows pan, + / − zoom and Home resets the view.

Lesion
Hemisphere
5 mm
Position

MNI x −38.0 · y −32.2 · z 29.1 mm

The ring marks a chosen distance beyond the sphere and counts the streamlines that run inside it. It is a geometric band for discussion, not a safe distance.

Sampled streamlines the sphere cuts

What this position disconnects

The bundle list appears when the reference atlas has loaded.

    How the lab decides

    A geometric test on group anatomy.

    Each bundle is drawn from its HCP1065 sample: at most 220 streamlines of the thousands in the population atlas (34,156 in the left arcuate fasciculus). A streamline counts as cut when any of its segments passes within the sphere's radius of the centre, and as inside the margin when it passes within the radius plus the margin.

    The test does not model oedema, infiltration, cortical injury, plasticity or where one person's tracts run. Only the chosen hemisphere's association and projection bundles and the commissures are tested; cerebellar pathways and cranial nerves are not.

    Atlas provenance and sampling limits

    Where the statements come from

    Quoted, never written here.

    Every statement is a verbatim sentence from the author’s white matter teaching notes, as recorded in the Hodos connections graph. The lab writes no deficit of its own: a bundle without a quoted statement says No quoted evidence.

    PMIDs are the ones listed on the slide a statement cites. Each was checked to exist at NCBI; the papers were not re-read against each sentence.

    The lab tests whole bundles. Statements that need damage on both sides, or that place the injury at one site of a bundle, stay under their bundle with that condition shown. Statements that name a visual field or a side of space are placed with the opposite hemisphere.

    Statements about the sagittal stratum and the temporal stem are not placed, because the atlas has no single bundle for either.

    Educational draft awaiting independent clinical review. Not for patient-specific planning.

    Browse the full connections graph