Proximal tubule
The epithelial wall of a proximal tubule displays a brush border on the luminal surface and infoldings of the basal plasma membrane on the basal surface. Tubular invaginations of the clefts between microvilli (apical canaliculi) extend into the cytoplasm. These canaliculi and poor fixation of the numerous mitochondria result in the foamy appearance of the cells seen at the light microscopic level. 5000x
Brush border
The epithelial wall of a proximal tubule displays a brush border on the luminal surface and infoldings of the basal plasma membrane on the basal surface. Tubular invaginations of the clefts between microvilli (apical canaliculi) extend into the cytoplasm. These canaliculi and poor fixation of the numerous mitochondria result in the foamy appearance of the cells seen at the light microscopic level. 5000x
Apical canaliculi
The epithelial wall of a proximal tubule displays a brush border on the luminal surface and infoldings of the basal plasma membrane on the basal surface. Tubular invaginations of the clefts between microvilli (apical canaliculi) extend into the cytoplasm. These canaliculi and poor fixation of the numerous mitochondria result in the foamy appearance of the cells seen at the light microscopic level. 5000x
Basal membrane infoldings
The epithelial wall of a proximal tubule displays a brush border on the luminal surface and infoldings of the basal plasma membrane on the basal surface. Tubular invaginations of the clefts between microvilli (apical canaliculi) extend into the cytoplasm. These canaliculi and poor fixation of the numerous mitochondria result in the foamy appearance of the cells seen at the light microscopic level. 5000x
Mitochondria
The epithelial wall of a proximal tubule displays a brush border on the luminal surface and infoldings of the basal plasma membrane on the basal surface. Tubular invaginations of the clefts between microvilli (apical canaliculi) extend into the cytoplasm. These canaliculi and poor fixation of the numerous mitochondria result in the foamy appearance of the cells seen at the light microscopic level. 5000x
Nucleus
The epithelial wall of a proximal tubule displays a brush border on the luminal surface and infoldings of the basal plasma membrane on the basal surface. Tubular invaginations of the clefts between microvilli (apical canaliculi) extend into the cytoplasm. These canaliculi and poor fixation of the numerous mitochondria result in the foamy appearance of the cells seen at the light microscopic level. 5000x
Lipid droplets
The epithelial wall of a proximal tubule displays a brush border on the luminal surface and infoldings of the basal plasma membrane on the basal surface. Tubular invaginations of the clefts between microvilli (apical canaliculi) extend into the cytoplasm. These canaliculi and poor fixation of the numerous mitochondria result in the foamy appearance of the cells seen at the light microscopic level. 5000x
Basal lamina
The epithelial wall of a proximal tubule displays a brush border on the luminal surface and infoldings of the basal plasma membrane on the basal surface. Tubular invaginations of the clefts between microvilli (apical canaliculi) extend into the cytoplasm. These canaliculi and poor fixation of the numerous mitochondria result in the foamy appearance of the cells seen at the light microscopic level. 5000x
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