This
image from the kidney shows cross sections of two distal convoluted tubules
(D) and several proximal convoluted tubules, the walls of which are composed
of a single layer of cuboidal cells. The circular nuclei located centrally
in the cells are characteristic of cuboidal epithelial cells.Although
the boundaries between the cells are indistinct, they are located about half
way between the adjacent nuclei, making the cells about as wide as they are
tall. Some nuclei appear to be missing (*) because they are either
are out of the plane of focus or in an adjacent section. Several flattened
nuclei (red arrows) of simple squamous cells belong to the endothelium of
capillaries.
