Cortex

{kor’-tcks) [L., bark]. I. The bark of an exogenous plant. 2. The surface layer of an organ. C. aurantii, orange-peel. C. cerebri, the external layer of gray master of the brain. C. renal is, the cortical substance of the kidney. Corti’s Arch; C. Canal; C. Organ. See Ear. 210