Hodos NETWORKS & TRACTS

Lesion lab · Group reference

Where a lesion sitsdecides what it disconnects.

Drag the sphere through the white matter. Every streamline it cuts stays lit end to end, and what the notes say about each bundle is quoted, never written here.

  • Radius10 mm
  • MarginOff
  • Bundles cut0
  • Streamlines cut0 of 0
Lesion controls
Hemisphere
5 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.

Corridors to the sphere

Choose an entry, then click the cortex where the corridor starts. The corridor runs straight to the sphere.

    A corridor counts the sampled streamlines that pass within half its diameter of a straight line from the entry to the sphere. It is a geometric line for discussion, not a planned trajectory.

    Precise position
    Centre the sphere on a bundle

    MNI x −38.0 · y −32.2 · z 29.1 mm

    View
    Oblique view

    Left hemisphere

    Group reference, not this patient.

    Loading reference anatomy…

    Drag the sphere to move it across the screen; drag anywhere else to rotate, and pinch or scroll to zoom. After Place entry A or B, click the cortex to set where that corridor starts. 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.

    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. A corridor is a straight cylinder from the chosen cortical point to the sphere's near surface; a streamline counts as cut by it when any segment passes within half the corridor's diameter of that line, and the corridor's count leaves out what the sphere already cuts.

    The test does not model oedema, infiltration, cortical injury, plasticity, brain shift, retraction 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