In 60 corpses of grown-up persons at the age of 21-90 years the number, size and form of the superior mesenteric lymph nodes and their vessels have been investigated. The lymph nodes in question, their afferent and deferent vessels have been revealed by means of interstitial injection of coloured masses into the small intestine wall, and subsequent injection of the lymph nodes situated in the mesentery. Certain sex differences have been revealed in the number, size and form of the superior mesenteric lymph nodes and their vessels.