cortex

in anatomy
https://doi.org/10.1351/goldbook.10561

Outer layer of an organ such as the kidney, the cerebellum, or the adrenal gland.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 739 [Terms] [Paper]