subendothelial layer

[ sŭb′ĕn-dō-thēlē-əl ]

n.

The thin layer of connective tissue lying between the endothelium and elastic lamina in the intima of blood vessels.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.