vasa recta


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va·sa rec·ta

straight vessels into which the efferent arteriole of the juxtamedullary glomeruli breaks up; they form a leash of vessels that, arising at the bases of the pyramids, run through the renal medulla toward the apex of each pyramid, then reverse direction in a hairpin turn, and run straight back again toward the base of the pyramid as venae rectae.

va·sa rec·ta

(vā'să rek'tă)
1. Straight vessels into which the efferent arteriole of the juxtamedullary glomeruli breaks up; they form a leash of vessels that, arising at the bases of the pyramids, run through the renal medulla toward the apex of each pyramid, then reverse direction in a hairpin turn, and run straight back again toward the base of the pyramid as venae rectae.

vasa recta

1. Tubules that become straight before entering the mediastinum testis.
2. Capillary branches of the renal efferent arterioles, parallel to the loops of Henle.
See also: vasa

vasa recta

one of a series of long loops of thin-walled blood vessels (efferent arterioles) that dip down alongside the loop of Henle in the vertebrate kidney. They pass blood into the interlumbar veins and then into the renal vein.
References in periodicals archive ?
In the lower 40% of the inner medulla, AQP1 expression is relatively low or absent in most descending thin limb segments of the inner medulla of rat, chinchilla, and kangaroo rat, and in descending vasa recta in the lower 40% of the inner medulla of rat and kangaroo rat (Chou et al.
The collective histotopography of inner medullary, AQP 1-positive and AQP 1-negative descending thin limbs, and vasa recta and their different water permeabilities is important for reducing the fluid load delivered to the deep inner medulla, and is related to the distinct contributions of these segments to the production of the corticomedullary osmotic gradient (Layton et al.
Persson, "Iodixanol, constriction of medullary descending vasa recta, and risk for contrast medium-induced nephropathy," Radiology, vol.
Intrinsic nitric oxide and superoxide production regulates descending vasa recta contraction," American Journal of Physiology--Renal Physiology, vol.
Due to their mesenteric location, simple diverticulectomy may impair blood flow due to damage to vasa recta and therefore may lead to anastomotic breakdown or fistula formation4-6.
The vasa recta of the small bowel seen in Crohn's disease become tortuous and enlarged.
A dense capillary bed projects within the medulla between the afferent (descending) and efferent (ascending) vasa recta.
The arrangement of the tubule vasculature helps the nephrons concentrate or dilute fluid by creating a countercurrent exchange between the solute and water-rich fluid within the tubule (coming from the Bowman's capsule) and the solute-and water poor descending vasa recta (and proximal capillaries) coming from the glomerulus.
Medullar hypoxia is therefore mainly caused by CM effects on the medullary vessels themselves, in particular, on the long and narrow vasa recta.
First, as mentioned above, viscosity-induced increase in tubular pressure probably compresses the vasa recta [53, 56].
These wedges are the renal pyramids formed by the long loops of Henle, medullary collecting tubules, and vasa recta.
Within the outer medulla, a peculiar gradient of hypoxic injury is noted, increasing from the better oxygenated region around vasa recta to the mid-interbundle zone, most remote from oxygen supply [1,12].