Page 90 - Atlas of Histology with Functional Correlations
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FIGURE 2.5 ■ Basal regions of epithelial cells. ×9,500.
FIGURE 2.6 | Basal Region of Ion-Transporting
Cell
A medium-magnification electron micrograph illustrates the basal region of a
cell from the distal convoluted tubule of the kidney. In contrast to the basal
regions of epithelial cells, the basal regions of cells in convoluted kidney tubules
are characterized by numerous and complex infoldings of the basal cell
membrane (5). These infoldings then form numerous basal membrane
interdigitations (10) with the similar infoldings of the neighboring cell.
Numerous and long mitochondria (4, 9) with vertical or apical–basal
orientations are located between the cell membrane infoldings.
A portion of a large nucleus (1) is visible with its dispersed chromatin (8).
Surrounding the nucleus is a distinct nuclear envelope (2), which consists of a
double membrane. Both the outer and inner membranes of the nuclear envelope
(2) fuse at intervals around the periphery of the nucleus to form numerous
nuclear pores (3).
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