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Cortex: Medullary ray

Components of medullary rays (medullary tissue in the cortex) are continuous with those in the medulla. Tubules in the medullary ray are arranged parallel to each other and, thus, in this region, longitudinal sections predominate. Medullary rays contain straight portions of proximal tubules, ascending thick limbs (distal straight tubules) and cortical portions of collecting ducts. The straight portions of the proximal tubule is also referred to as the descending thick limb. 10x, 600x

Proximal straight tubules > <p>Proximal straight tubules have a tall cuboidal epithelium, regular arrangement of nuclei around the tubule and a brush border (obscured here by the luminal contents). Ascending thick tubules are lined by a lower cuboidal epithelium with irregularly spaced nuclei that frequently bulge into the lumen. Collecting tubules have columnar epithelia with conspicuous lateral cell boundaries.</p>

Proximal straight tubules >

Proximal straight tubules have a tall cuboidal epithelium, regular arrangement of nuclei around the tubule and a brush border (obscured here by the luminal contents). Ascending thick tubules are lined by a lower cuboidal epithelium with irregularly spaced nuclei that frequently bulge into the lumen. Collecting tubules have columnar epithelia with conspicuous lateral cell boundaries.
- Brush border <p>Proximal straight tubules have a tall cuboidal epithelium, regular arrangement of nuclei around the tubule and a brush border (obscured here by the luminal contents). Ascending thick tubules are lined by a lower cuboidal epithelium with irregularly spaced nuclei that frequently bulge into the lumen. Collecting tubules have columnar epithelia with conspicuous lateral cell boundaries</p>

- Brush border

Proximal straight tubules have a tall cuboidal epithelium, regular arrangement of nuclei around the tubule and a brush border (obscured here by the luminal contents). Ascending thick tubules are lined by a lower cuboidal epithelium with irregularly spaced nuclei that frequently bulge into the lumen. Collecting tubules have columnar epithelia with conspicuous lateral cell boundaries
Ascending thick limb <p>Proximal straight tubules have a tall cuboidal epithelium, regular arrangement of nuclei around the tubule and a brush border (obscured here by the luminal contents). Ascending thick tubules are lined by a lower cuboidal epithelium with irregularly spaced nuclei that frequently bulge into the lumen. Collecting tubules have columnar epithelia with conspicuous lateral cell boundaries</p>

Ascending thick limb

Proximal straight tubules have a tall cuboidal epithelium, regular arrangement of nuclei around the tubule and a brush border (obscured here by the luminal contents). Ascending thick tubules are lined by a lower cuboidal epithelium with irregularly spaced nuclei that frequently bulge into the lumen. Collecting tubules have columnar epithelia with conspicuous lateral cell boundaries
Collecting duct <p>Proximal straight tubules have a tall cuboidal epithelium, regular arrangement of nuclei around the tubule and a brush border (obscured here by the luminal contents). Ascending thick tubules are lined by a lower cuboidal epithelium with irregularly spaced nuclei that frequently bulge into the lumen. Collecting tubules have columnar epithelia with conspicuous lateral cell boundaries</p>

Collecting duct

Proximal straight tubules have a tall cuboidal epithelium, regular arrangement of nuclei around the tubule and a brush border (obscured here by the luminal contents). Ascending thick tubules are lined by a lower cuboidal epithelium with irregularly spaced nuclei that frequently bulge into the lumen. Collecting tubules have columnar epithelia with conspicuous lateral cell boundaries
Main SlideProximal straight tubules > - Brush borderAscending thick limbCollecting duct