Inferior mesenteric lymph nodes

• (a) small glands on the branches of the left colic and sigmoid arteries
• (b) a group in the sigmoid mesocolon, around the superior hemorrhoidal artery
• (c) a pararectal group in contact with the muscular coat of the rectum

Structure

The inferior mesenteric lymph nodes are lymph nodes present throughout the hindgut.

Afferents

The inferior mesenteric lymph nodes drain structures related to the hindgut; they receive lymph from the descending colon, sigmoid colon, and proximal part of the rectum.

Efferents

They drain into the superior mesenteric lymph nodes and ultimately to the preaortic lymph nodes. Lymph nodes surrounding the inferior mesenteric artery drain directly into the preaortic nodes.