Page 130 - Atlas of Histology with Functional Correlations

capillary walls to the surrounding cells. In the lungs, the simple squamous

epithelium allows efficient gas exchange or transport between the thin-
walled capillaries and alveoli.

FIGURE 4.4 | Different Epithelial Types in Kidney

Cortex

This high-power photomicrograph of the kidney illustrates the different types of
epithelia that are present in the kidney cortex (peripheral region). Simple
squamous epithelium (1) lines the outer portion of the double-layered epithelial

capsule called the Bowman capsule (5). The inner layer of the capsule
surrounds the capillaries (3) of the glomerulus (2). The glomerulus (2) is a tuft
of capillaries (3) where blood filtration takes place. Simple squamous epithelium

called endothelium (4, 9) also lines the capillaries (3) and all blood vessels (8).
Simple cuboidal epithelium (6) lines the lumina of the surrounding convoluted
tubules (7). The blue-staining fibers surrounding the Bowman capsule (5),
convoluted tubules (7), and blood vessels (8) in the kidney cortex are the
collagen fibers of the connective tissue (10).

FIGURE 4.4 ■ Different epithelial types in the kidney cortex. Stain: Masson
trichrome. ×120.

FIGURE 4.5 | Simple Columnar Epithelium:

Stomach Surface

The surface of the stomach is covered by a tall, simple columnar epithelium

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