SMALL-MEDIUM VENULES:  Slightly larger vessels with a greater diameter,

Intima:  Endothelium, slight subendothelial layer, occasional IEL. 

VALVES MAY BE SEEN.  Semilunar folds of the intimal endothelium that project into the lumen.  Elastic tissue lined by endothelium

Media:  Slight thickness from 3-7 layers of smooth muscle, occasionally longitudinally oriented, as well as some collagen and elastic fibers.

Adventitia:  Thickest component still with collagen and elastic fibers, some smooth muscle cells (longitudinal orientation) as well as a vasa.