Histo Lab- Urinary System (Aughey)

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Kidney (horse). (1) Capsule. (2) Outer area of the cortex. (3) Renal corpuscle. (4) Uriniferous tubules. H & E. ×62.5.

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Kidney cortex (dog). (1) Renal corpuscle. (2) Uriniferous tubules. (3) Medullary ray. H & E. ×12.

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Kidney cortex (dog). (1) Renal corpuscle. (2) Uriniferous tubules. (3) Medullary ray. H & E. ×125.

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Kidney medulla (dog). (1) Blood vessels. (2) Collecting tubules. (3) Ascending thin limb. (4) Descending thin limb. H & E. ×125.

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Kidney (horse). (1) Renal corpuscle with (2) capsular space (3) the urinary pole. (4) Proximal convoluted tubule. (5) Distal convoluted tubule with (6) the macula densa. H/PAS. ×250.

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Kidney (dog). (1) Part of the podocyte. (2) Secondary foot processes, the pedicles – the filtration slit pores are the spaces between the solid pedicles. Scanning electron micrograph.×1500.

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Kidney (dog). The renal corpuscle projects from the surrounding tissue. Scanning electron micrograph. ×500.

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Kidney (horse). The width of the glomerular capsule is shown by the line. (1) Renal corpuscle with epithelial cells and mesangium. (2) Vascular pole. (3) Capsular space. (4) Distal convoluted tubule. (5) The macula densa. (6) Proximal convoluted tubule. H & E. ×250.

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Kidney (horse). (1) Renal corpuscle with epithelial cells and mesangium. (2) Urinary pole opening into (3) the proximal convoluted tubule. (4) Distal convoluted tubule and macula densa. H & E. ×250.

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Kidney medulla (dog). (1) Capillaries lined by endothelium. (2) Collecting tubules lined by cuboidal cells. (3) Ascending limb lined by cuboidal epithelium. (4) Descending limb lined by squamous epithelium. H & E. ×125.

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Kidney. Renal pelvis (sheep). The renal pelvis is lined by urethelium resting on a vascular lamina propria. H & E. ×62.5.

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Kidney. Renal pelvis (horse). The renal pelvis is lined by urethelium; simple mucus-secreting glands are present in the lamina propria. H/PAS. ×62.5.

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Ureter (horse). (1) Urethelium. (2) Simple mucus secreting tubular glands. (3) Vascular lamina propria. H/PAS. ×250.

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Ureter (dog). (1) Urethelium lines the lumen of the ureter. (2) Vascular lamina propria. (3) Muscularis externa. H & E. ×62.5.

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Ureter (dog). The elastic fibres are stained reddish orange. Van Giesen. ×62.5.

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Urinary bladder (dog). The bladder is relaxed and the surface cells are rounded adjacent to the lumen (arrowed). H & E. ×125.

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Urinary bladder (dog). The bladder is stretched and the surface cells are flattened (arrowed). H & E. ×250.

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Kidney (bird). (1) The central, pale staining medullary area is surrounded by (2) the much denser staining cortical area. (3) Lobar duct. (4) Renal vein. H & E. ×25.

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Kidney cortex (bird). (1) The renal corpuscule has a central mass of epithelial cells and mesangial cells. (2) Proximal convoluted tubule. (3) Distal convoluted tubule. (4) Small collecting tubule with low columnar mucus-secreting epithelium. H & E. ×125.

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Ureter (bird). (1) Pseudostratified mucus-secreting epithelium lines the lumen. (2) Cellular lamina propria with groups of lymphocytes (arrowed). (3) Muscularis externa. H/PAS. ×125.

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The kidneys of some species of sexually mature male snakes and lizards possess a characteristic ‘sexual segment granulation’ which is discerned by a marked hypertrophy and eosinophilic granularity of the distal convoluted tubules. This makes the kidneys of sexually mature males readily distinguishable from the kidneys of sexually mature females of the same species. Illustrated is a section of kidney from a mature male timber rattlesnake (Crotalus horridus). H & E. ×125.