Straight arterioles of kidney
In the blood supply of the kidney, the straight arterioles of kidney (or vasa recta renis) are a series of straight capillaries in the medulla (Latin: vasa, "vessels"; recta, "straight"). They lie parallel to the loop of Henle.
A nephron, the vasa recta are labeled arteriolae rectae
|Branches||Straight venules of kidney, arcuate vein|
|Latin||arteriolae rectae renis|
These vessels branch off the efferent arterioles of juxtamedullary nephrons (those nephrons closest to the medulla), enter the medulla, and surround the loop of Henle. The straight arterioles are peritubular capillaries, specifically those that surround the loop of Henle.
Each straight arteriole has a hairpin turn in the medulla and carries blood at a very slow rate – two factors crucial in the maintenance of countercurrent exchange that prevent washout of the concentration gradients established in the renal medulla.
The maintenance of this concentration gradient is one of the components responsible for the kidney's ability to produce concentrated urine.
On the descending portion of the straight arterioles, sodium chloride and urea are reabsorbed into the blood, while water is secreted. On the ascending portion, sodium chloride and urea are secreted into the interstitium, while water is reabsorbed
The slow blood flow in the straight arterioles makes them a likely location of thrombosis in hypercoagulable states, or tissue loss due to erythrocyte sickling in sickle cell disease. Ischemia that results may lead to renal papillary necrosis.
However, other sources consider "vasa recta renis" to refer to both the arterial and venous portions.
The "renis" is often omitted, but there are two other structures with the same name:
- https://web.archive.org/web/20150509033539/http://faculty.stcc.edu/AandP/AP/AP2pages/Units24to26/urinary/nephron.htm. Archived from the original on 2015-05-09. Missing or empty
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- jejunumileum at The Anatomy Lesson by Wesley Norman (Georgetown University)