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n. Hardening, narrowing or loss of elasticity in the arterioles.

n. a form of arteriosclerosis which affects predominantly the arterioles, found especially in people with chronic hypertension.

n. sclerosis of the arterioles

"Brain autopsies on 418 members of a Chicago religious order, who were assessed for Parkinson's symptoms from 1994 until their death, found small blood vessel blockages, or microinfarcts, in 33 (7.9%) cases and arteriolosclerosis (small vessel disease) in 62 (14.8%)."

sclerosis    induration