renal lobule

It is composed of many renal lobules, which are not visible without a microscope.

A cortical lobule (or renal lobule) is a part of a renal lobe.

Ferrein's pyramid: Also known as the medullary ray, which is the center of the renal lobule, and is shaped like a small pyramid.

In anatomy, the medullary ray (Ferrein's pyramid) is the middle part of the cortical lobule or renal lobule, consisting of a group of straight tubes to the collecting ducts.