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Renal histology
Renal histology lectures 1 and 2
| Question | Answer |
|---|---|
| Filtration barrier | fenestrations of glomerular capillaries, fused basement membrane, filtration slits |
| Juxtaglomerular apparatus | Extraglomerular mesangial cells, macula densa (modified DCT), granular/juxtaglomerular cells (modified SM of affarent arteriole) |
| Parietal layer of Bowmann's capsule | simple squamous |
| PCT (convoluted portion) | simple cuboidal, brush border (reabsorption), basolateral interdigitations (Na+ transport out), mitochondria (active transport) |
| Pars Recta (thick descending limb) | brush border (secretion of organic acids), no basolateral interdigitations, mitochondria (active transport) |
| Thin limbs | simple squamous |
| Thick ascending limb | simple cuboidal, no brush border, basolateral interdigitations (Na+ transport), mitochondria (active transport), Tomm-Horsfall protein production |
| Distal convoluted tubule | simple cuboidal, no brush border, basolateral interdigitations (Na+ transport), mitochondria (active transport) |
| Collecting tubule cell types | principal cells + intercalated cells + DCT cells |
| Collecting tubule histocytology | simple cuboidal, intercalated have darker staining and brush border remnant |
| Principal cell function | Na+ reabsorption, K+ secretion, H2O reabsorption (ADH mediated) |
| Intercalated cell function | Acid-base balance |
| Collecting duct cell types | principal cells + intercalated cels |
| Collecting duct histocytology | simple columnar |
| Vasa recta | simple squamous with RBCs inside (if not washed out) |
| Ureters | transitional epithelium, lamina propria, circular/longitduinal SM, adventitia |
| Transitional epithelium details | stratified with mature surface cells which are cuboidal/columnar called umbrella cells |
| Umbrella cell surface | inflexible plaques with surface vesicle invaginations in between |
| Bladder histology | transitional epithelium, lamina propria, circular/longitudinal/circular SM, adventitia |
| Prostatic urethra | transitional epithelium (continuation of bladder) |
| Membranous urethra | psuedostratified columnar |
| Spongy urethra | stratified columnar/squamous |