Straight arterioles of kidney
| Straight arterioles | |
|---|---|
| File:Kidney nephron.png
A nephron, the vasa recta is labelled arteria recta
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| Details | |
| Latin | arteriolae rectae renis |
| Source | Arcuate arteries of the kidney, efferent arteriole |
| Branches | Straight venules of kidney, arcuate vein |
| Identifiers | |
| Dorlands /Elsevier |
Vasa recta renis |
| TA | Lua error in Module:Wikidata at line 247: invalid escape sequence near '"^'. |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terminology [[[d:Lua error in Module:Wikidata at line 247: invalid escape sequence near '"^'.|edit on Wikidata]]]
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- For the intestinal structure, see Vasa recta (intestines)
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.
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.[1]
Histology
On a histological slide, the straight arterioles can be distinguished from the tubules of the loop of Henle by the presence of blood.[2]
Function
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.[3]
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, NaCl and urea are reabsorbed into the blood, while water is secreted. On the ascending portion, NaCl and urea are secreted into the interstitium, while water is reabsorbed.
Nomenclature
According to Terminologia Anatomica, the term "vasa recta renis" is an alternate name for "arteriolae rectae renis", and a separate term, venulae rectae renis, is used to identify the venous portion.
However, other sources consider "vasa recta renis" to refer to both the arterial and venous portions.[4]
The "renis" is often omitted, but there do exist two other structures with the same name:
- vasa recta (intestines) (in the ileum and jejunum)[5]
- the straight portion of the seminiferous tubule, though this is usually called the tubuli recti.
Pathology
The slow blood flow in the straight arterioles makes them a likely location of thrombosis in hypercoagulable states, or tissue loss[6] due to erythrocyte sickling in sickle cell disease. Ischemia that results may lead to renal papillary necrosis.
References
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- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Histology image:15802loa from Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Physiology: 7/7ch08/7ch08p07 - Essentials of Human Physiology
- ↑ Histology image:15804loa from Lua error in package.lua at line 80: module 'strict' not found.
- ↑ jejunumileum at The Anatomy Lesson by Wesley Norman (Georgetown University)
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
