A cortical lobule (or renal lobule) is a part of a renal lobe. It consists of the nephrons grouped around a single medullary ray, and draining into a single collecting duct. Its near identical parallel is the rectal lobe^{[citation needed]}, which is present in the majority of mammals.

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

• Histology image: 16003loa – Histology Learning System at Boston University