Artery and vein (labels) - histology illustration

Transverse section through a small artery and vein of the mucous membrane of the epiglottis of a child. X350. (Klein and Noble Smith.) A-Artery, showing the nucleated endothelium; V-Vein; m-tunica media; e-endothelium; a-tundica adventita.

Histology illustration courtesy of Gray's Anatomy.