Renal microvasculature in the adult pipid frog,Xenopus laevis : A scanning electron microscope study of vascular corrosion casts
| Autor: | Alois Lametschwandtner, Bernd Minnich |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Male
0106 biological sciences 0301 basic medicine Efferent arteriole kidney Afferent arterioles Xenopus Biology Corrosion Casting urologic and male genital diseases 010603 evolutionary biology 01 natural sciences Veins Mesonephric duct Xenopus laevis 03 medical and health sciences Imaging Three-Dimensional Renal capsule medicine Animals Vein Research Articles Kidney urogenital system Vasa recta Arteries Anatomy Endothelial stem cell Arterioles 030104 developmental biology medicine.anatomical_structure vascular casts Microvessels Microscopy Electron Scanning cardiovascular system Female Animal Science and Zoology scanning electron microscopy Research Article Developmental Biology |
| Zdroj: | Journal of Morphology |
| ISSN: | 1097-4687 0362-2525 |
| DOI: | 10.1002/jmor.21132 |
| Popis: | We studied the opisthonephric (mesonephric) kidneys of adult male and female Xenopus laevis using scanning electron microscopy (SEM) of vascular corrosion casts and light microscopy of paraplast embedded tissue sections. Both techniques displayed glomeruli from ventral to mid‐dorsal regions of the kidneys with single glomeruli located dorsally close beneath the renal capsule. Glomeruli in general were fed by a single afferent arteriole and drained via a single thinner efferent arteriole into peritubular vessels. Light microscopy and SEM of vascular corrosion casts revealed sphincters at the origins of afferent arterioles, which arose closely, spaced from their parent renal arteries. The second source of renal blood supply via renal portal veins varied interindividually in branching patterns with vessels showing up to five branching orders before they became peritubular vessels. Main trunks and their first‐ and second‐order branches revealed clear longish endothelial cell nuclei imprint patterns oriented parallel to the vessels longitudinal axis, a pattern characteristic for arteries. Peritubular vessels had irregular contours and were never seen as clear cylindrical structures. They ran rather parallel, anastomosed with neighbors and changed into renal venules and veins, which finally emptied into the ventrally located posterior caval vein. A third source of blood supply of the peritubular vessels by straight terminal portions of renal arteries (vasa recta) was not found. Scanning electron microscopy of vascular corrosion casts of kidneys of adult Xenopus laevis convincingly confirms that renal portal veins supply most of the renal parenchyma and renal arteries primarily feed renal glomeruli. |
| Databáze: | OpenAIRE |
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