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Insular Cortex

VIEWS: 6 PAGES: 4

									Insular Cortex

Protocol refers to images of the right hemisphere

   1. The insular cortex is between the frontal lobe
      and temporal lobe. Its superior boundary is the
      circular insular sulcus and its inferior boundary
      is the sylvian fissure. The insular cortex is the
      area enclosed between these two boundaries. A
      3D object model is not necessary to mask the
      insular cortex. Begin masking in the sagittal
      view, at a somewhat medial slice where the
      circular insular sulcus and sylvian fissure are
      both clearly visible. Trace the circular insular
      sulcus until meeting the sylvian fissure then
      trace the sylvian fissure until meeting the
      circular insular sulcus. Mask everything within
      the boundaries.
   2. When the boundary between the insular cortex’s gray matter is undistinguishable from the gray matter of
      neighboring structures (i.e. subcentral gyrus, anterior transverse temporal gyrus, superior temporal gyrus
      and inferior frontal gyrus), mask halfway through the grey matter boundary so as to not include parts of
      neighboring structures. Continue to move laterally until the insular cortex disappears.
3. Return to the first masked slice and move
   medially. Eventually, the vertical ramus
   emerges between the circular insular sulcus
   and the sylvian fissure. Medially, the vertical
   ramus is the insular cortex’s anterior
   boundary. Trace the circular insular sulcus
   until it meets the vertical ramus, trace the
   vertical ramus until it meets the sylvian fissure
   and then trace the sylvian fissure until
   returning to circular insular sulcus. Mask
   everything inside these boundaries. Continue
   this step until the boundaries are no longer
   continuous. (Fig. 5)

4. When the circular insular sulcus and sylvian
   fissure are no longer continuous, the insular
   cortex is masked as multiple regions. Sulci
   that are no longer continuous are masked as
   separate areas. Trace boundaries previously described to where they end and connect the two endpoints.
   Mask everything within the created boundaries. Continue this step until all traces of the circular insular
   sulcus. Repeat all steps for other hemisphere.
Some note: Once finished look at the coronal view to validate work make sure that you exclude the putamen and
the white matter surrounding it but make sure to include the other white matter that is seen within the insular
cortex. Notice that some white matter is included.

								
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