Key result
Scanning electron microscopy of rat renal corpuscles demonstrated typically one afferent and one efferent arteriole, and a small transition area for the extraglomerular mesangium.
Observational (n=64)
SEM studies of rat glomeruli demonstrate that the vast majority have a single afferent and efferent arteriole, and the extraglomerular mesangium area is too small to act as a fixed point for contraction.
The vascular poles of 30 renal corpuscles were studied in critical-point dried renal cortex of the Munich-Wistar rat by scanning electron microscope (SEM). In 28 cases one afferent and one efferent arteriole were observed; one was done in the Sprague-Dawley rat, where 34 renal corpuscles were examined. One afferent and a single efferent arteriole were found in 32 cases; in one case only one afferent and two efferent arterioles were observed. In another case it was questioned whether a single or a double efferent arteriole is present. In addition, the specimens allowed an evaluation of the area where the extraglomerular mesangium passes into the mesangial cells of the glomerular tuft. This area was found to be rather small to represent a "punctum fixum" for a contraction of the entire mesangium.
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Frank et al. (1982) reported an observational. Scanning electron microscopy was evaluated on Vascular pole anatomy. Scanning electron microscopy of rat renal corpuscles demonstrated typically one afferent and one efferent arteriole, and a small transition area for the extraglomerular mesangium.
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