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Anatomy, Retroperitoneum: Nerve Supply to the Kidneys
Introduction
The kidneys are bilateral retroperitoneal organs located just below the diaphragm, exhibiting the highest degree of innervation after the adrenal glands.[1][2][3] The superior margin of the left kidney is usually near the T12 vertebra at approximately the level of the 11th rib, extending to L3, whereas the right kidney lies slightly lower, between the 12th rib and L3. The lower position of the right kidney reflects its placement beneath the liver.
Renal innervation comprises both afferent and efferent fibers forming the renal plexus (see Image. Renal and Adrenal Nerve Pathways).[4] Afferent fibers mediate nociception, enabling detection of renal pain and other sensory signals. Efferent fibers are predominantly sympathetic and play a central role in regulating renal blood flow, renin release, and systemic blood pressure.[5][6][7][8][9][10]
The renal plexus receives input from multiple contributing plexuses that accompany the renal artery and vein before entering the hilum of the kidney.[11] The clinical relevance of renal nervous system anatomy in blood pressure regulation has increased substantially with the development and U.S. Food and Drug Administration approval of catheter-based renal denervation devices for treating patients with drug-resistant hypertension.[12][13][14]
The critical role of renal innervation in regulating blood pressure and kidney function underscores its significance in managing cardiovascular and renal disorders. Advances in catheter-based renal arterial denervation therapies have highlighted the functional impact of the sympathetic perivascular nerve supply of the kidneys in patients with drug-resistant hypertension.[15][16] A comprehensive understanding of renal nerve anatomy and physiology enables clinicians to guide procedural strategy, optimize patient selection, and anticipate therapeutic outcomes (see Image. Kidney Anatomy).
Structure and Function
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Structure and Function
The kidney receives innervation from the renal plexus, a mixed neural network comprising sympathetic, visceral afferent, and parasympathetic fibers, with parasympathetic fibers absent from the renal parenchyma. Parasympathetic fibers have been identified in the renal pelvis and the arterial supply of the kidney, but evidence of parasympathetic innervation within the renal parenchyma remains lacking.[17][18][19] The renal plexus receives input from the celiac plexus, aortorenal ganglia, thoracic splanchnic nerves (T10-T12), lumbar splanchnic nerves (L1-L2), the intermesenteric plexus, and indirectly from the posterior vagal trunk via the celiac plexus.[20]
Renal afferent fibers originate predominantly from the renal pelvis, where their density is highest, and also from the renal cortex. These fibers project to central nervous system structures, including the subfornical organ, hypothalamus, and brainstem.[21] Pain arising from the kidney occurs in response to ischemia, infection, obstruction, or parenchymal injury. The sensation typically follows a dermatomal pattern along the anterior abdominal wall and flanks and is transmitted via visceral afferent fibers.[22][23][24] Afferent innervation is required for nociceptive signaling.
Efferent innervation of the kidney is primarily sympathetic and receives input from each contributing plexus. Sympathetic preganglionic fibers synapse in prevertebral and paravertebral ganglia before postganglionic axons join the renal plexus (see Image. Sympathetic Chain and Trunk).[25][26] The sympathetic supply is predominantly adrenergic and arises from the spinal cord (T8-L1), the paravertebral sympathetic chain, the least and lesser splanchnic nerves, and the upper lumbar splanchnic nerves.[27]
Renal sympathetic activity constitutes 1 of 3 physiological mechanisms involved in the regulation of blood pressure.[28] The other mechanisms are carotid baroreceptors, which monitor vascular hydrostatic pressure, and the juxtaglomerular apparatus, which regulates renal blood flow and glomerular filtration rate in response to changes in sodium concentration in the filtrate.[29][30]
Sympathetic stimulation of the kidney causes constriction of afferent arterioles and activates the juxtaglomerular apparatus, increasing plasma renin activity, triggering the renin-angiotensin-aldosterone system, and enhancing renal sodium reabsorption. Collectively, these effects contribute to the maintenance of systemic blood pressure.[31][32][33][34][35][36][37][38] Denervation of renal sympathetic nerves has been shown to reduce mean systolic blood pressure in most patients with drug-resistant hypertension and is recommended in guidelines for selected patients unresponsive to standard therapy.[39][40] For further details, refer to the StatPearls reference “Renal Denervation Therapy for Drug-Resistant Hypertension.”[41]
Embryology
Afferent renal innervation appears early in fetal development, likely preceding the formation of efferent fibers.[42] Evidence indicates that renal nerves play a critical role in proper embryological kidney development.[43][44] The kidney lacks innervation from the renal plexus during the initial embryonic period. Renal innervation begins on embryonic day 13.5, with nerves detectable around 9 weeks of gestation as branches of the immature autonomic abdominal plexus.[45][46] This development coincides with the formation of the renal veins, approximately 2 weeks after differentiation of the renal arteries.[47] Afferent input is required for normal kidney morphogenesis, regulating renal hemodynamics during early fetal life, modulating renin secretion during pregnancy, and supporting fluid and electrolyte homeostasis in late gestation.[48]
Blood Supply and Lymphatics
The kidney receives its primary arterial blood supply from the renal artery, a direct branch of the abdominal aorta.[49] Renal vascular anatomy may include multiple main arteries and accessory vessels.[50] All renal arteries function as end arteries, as the kidney lacks collateral arterial circulation.[51][52][53] Awareness of accessory renal vessels is important during aortic aneurysm repair, nephrectomy, partial nephrectomy, endovascular interventions, and renal denervation therapy.[54][55]
Accessory renal arteries occur in approximately 20% to 30% of the population, representing a significant consideration for patients undergoing kidney surgery.[56][57][58][59][60][61][62][63][64] Renal lymphatic drainage parallels the major renal vessels, originating in the cortex and ultimately draining into the paraaortic lymph nodes.[65]
Nerves
Sympathetic renal innervation arises from neurons in the intermediolateral cell columns of spinal cord segments T8 to L1, which give rise to preganglionic fibers forming the lesser and least splanchnic nerves.[66][67][68][69] These fibers synapse with postganglionic neurons in the celiac and aorticorenal ganglia, establishing the renal nerve plexus within the adventitia of the main and accessory renal arteries (see Image. Kidney Nerve Supply Diagram).[70][71][72]
Efferent sympathetic fibers extend throughout the renal cortex and outer medulla, encompassing the interlobar, arcuate, and interlobular arteries, as well as glomerular arterioles.[73] Sympathetic nerve density is highest in afferent glomerular arterioles, followed by efferent arterioles, thick ascending limbs, and distal convoluted tubules.[74][75][76] The inner renal medulla contains few sympathetic fibers.[77] Sympathetic renal nerves innervate the renal vasculature, juxtaglomerular apparatus, and renal tubules, increasing blood pressure by elevating norepinephrine levels, stimulating renin release, enhancing tubular sodium and water reabsorption, and inducing renal vasoconstriction.[78][79][80][81][82][83][84][85][86][87]
Activation of sympathetic fibers to the kidneys primarily reduces cortical blood flow, while intense stimulation also decreases medullary perfusion.[88] These nerves contribute to renovascular hypertension caused by renal artery stenosis or kidney irradiation.[89][90] Recent evidence indicates that sympathetic stimulation promotes renal fibrosis via activation of M2 macrophages, whereas sympathetic denervation reduces acute tubular necrosis, macrophage accumulation, and tubulointerstitial fibrosis induced by ureteral obstruction and ischemia/reperfusion.[91]
Sensory fibers originating from the dorsal root ganglia travel alongside sympathetic renal nerves.[92][93] These fibers transmit signals from mechanoreceptors and chemoreceptors in the renal pelvis to the spinal cord and brain, modulating the renorenal reflex and related functions.[94] Sensory fibers are densest in the renal pelvis. These nerves are present in the cortex and proximal ureter and absent from the renal medulla.[95][96][97][98][99] The fibers course adjacent to the renal artery to the dorsal root ganglia of T12 to L3, then ascend the spinal cord to the brainstem and hypothalamus, contributing to the regulation of sympathetic nerve activity and systemic blood pressure.[100]
Parasympathetic renal innervation originates from the dorsal motor nucleus of the vagus nerve in the medulla oblongata, the most inferior portion of the brainstem.[101][102] Preganglionic fibers travel via the vagus nerve (cranial nerve X) and form renal branches that join the plexus surrounding the renal arteries, providing parasympathetic input and promoting vasodilation upon stimulation.[103] Intrarenal parasympathetic fibers are sparse, although vagal afferent activation enhances renal dopamine release.[104]
Visceral afferent fibers transmit renal pain signals to spinal ganglia and cord segments T11 to L2. Pain may result from obstructive uropathy, including ureteral calculi, distension of the renal pelvis, infection, inflammation, or ischemia, corresponding to the affected dermatome. Nonobstructing and uninfected stones generally do not elicit flank or renal pain.[105][106][107][108]
Muscles
The left and right kidneys are positioned on the corresponding psoas major and quadratus lumborum muscles.[109] This anatomical relationship guides the course of sympathetic and afferent nerve fibers traveling to the renal plexus, thereby influencing renal innervation pathways and the patterns of referred pain.
Physiologic Variants
The renal plexus comprises fibers originating from the aorticorenal ganglia, lumbar splanchnic nerves, and the least splanchnic nerve, with additional contributions from the celiac, aortic, and intermesenteric plexuses.[110] These fibers join the renal arteries, including extrarenal branches, segmental vessels, and accessory arteries, at variable intervals and accompany the renal vessels into the parenchyma, providing both sympathetic efferent and afferent signaling.[111][112][113][114][115][116][117] Fibers associated with the celiac ganglion exhibit considerable variation in diameter, size, and number of ganglia.[118] Lumbar splanchnic nerves typically arise from spinal roots T12 to L1, although origins may extend to T11 or skip 1 or more spinal segments.[119]
Surgical Considerations
Renal transplantation disrupts the nerve fibers of the renal plexus, abolishing renal sympathetic activity. In the absence of sympathetic input, β1-adrenergic stimulation of juxtaglomerular cells is lost, thereby attenuating one mechanism of renin-angiotensin-aldosterone system activation. The transplanted kidney retains the ability to regulate systemic blood pressure via intrinsic autoregulatory mechanisms, including the myogenic response and macula densa-mediated sodium feedback.[120]
Clinical Significance
Renal sympathetic nerve activity is increased in patients with hypertension.[121] This elevation promotes sodium and water reabsorption, reduces renal blood flow, and stimulates renin release. Chronic sympathetic overactivity can contribute to impaired kidney function and cardiac hypertrophy.
Renal denervation therapy, achieved via ablation of the sympathetic nerve supply to the kidneys, is emerging as a viable option for selected patients with drug-resistant hypertension.[122][123][124][125][126] Unlike historical sympathectomy procedures, these approaches provide a safe, permanent, minimally invasive intervention without the adverse effect of postural hypotension. Renal denervation using endovascular ultrasound or radiofrequency devices has demonstrated efficacy in multiple sham-controlled, randomized clinical trials.[127][128][129][130][131][132][133][134][135] Such procedures are likely to become increasingly utilized in the future.
Media
(Click Image to Enlarge)
Kidney Anatomy. This illustration shows the internal structure of the kidney, highlighting key features such as the capsule, cortex, medulla, and renal pyramids. Other important labeled components include the minor and major calyces, the renal papilla, artery, vein, and pelvis, fat in the sinus, and the ureter. A clear view of the blood vessels and urine-collecting structures within the kidney is provided.
Contributed by S Dulebohn, MD
(Click Image to Enlarge)
Kidney Innervation. The image illustrates the nerve supply to the kidney, showing connections from the celiac ganglion, superior mesenteric ganglion, and aorticorenal ganglia. Renal plexus fibers accompany the renal artery, passing through the aortic plexus and linking with both the inferior mesenteric ganglion and artery. Spinal sensory ganglia and the lumbar sympathetic trunk are positioned near the gonadal artery and ureter. Inferior and superior hypogastric plexuses converge with hypogastric and pelvic splanchnic nerves, which innervate regions near the pelvis. All major labeled anatomical structures are identified and interconnected by nerve pathways in this schematic.
Illustrated by K Humphreys
(Click Image to Enlarge)
Renal and Adrenal Nerve Pathways. The diagram shows greater and lesser splanchnic nerves arising from the spinal cord and traveling through the sympathetic chain. These nerves reach the celiac ganglion, sending fibers to the aorta, renal artery, kidney, and adrenal medulla. The vagus nerve connects from the dorsal motor nucleus of the vagus in the medulla to both the kidney and adrenal gland, illustrating sympathetic and parasympathetic connections. Each labeled structure is represented by brief, direct neural pathways in the illustration.
Contributed by K Humphreys
(Click Image to Enlarge)
Sympathetic Chain and Trunk. This image depicts the anatomical relationship between the sympathetic chain and sympathetic trunk as they run alongside the vertebral column. The sympathetic chain consists of interconnected ganglia forming a vertical structure, whereas the sympathetic trunk refers to the paired nerve cords that extend along the vertebral bodies. The vertebra is shown for anatomical orientation to highlight the proximity of these sympathetic nervous system components to the spinal column.
Contributed by K Humphreys
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