cortical

/หˆkษ”ห.tษช.kษ™l/
adjective
  1. 1

    Pertaining to the outer layer of an internal organ or body structure, such as the kidney or the brain.

  2. 2

    Pertaining to the cortex of a stem or rootโ€”the tissue that lies inward from the epidermis, but exterior to the vascular tissue.

Source: https://en.wiktionary.org/wiki/cortical