The inner layer or lining membrane of an artery, composed of endothelial tissue that contacts the flowing blood.
From endo- (within) + arterium (artery + Latin -ium neuter noun ending). This anatomical term uses Latin conventions to name the specific inner tissue layer of arteries.
The endarterium is lined with endothelial cells that sense fluid pressure and chemistry of blood flowing past them, giving them the power to tell the artery to relax or constrict—basically making them tiny command centers monitoring your circulation.
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