juxtacortical

Etymology
From.

Adjective

 * 1)  Next to a cortex; thus:
 * 2)  Abutting the cortical layer of bone, as with juxtacortical chondroma.
 * 3)  Abutting the cerebral cortex (and thus involving subcortical U-fibers), as with juxtacortical white matter lesions in multiple sclerosis.