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The nerves from these sources, fifteen or twenty in number, have a few ganglia developed upon them. It enters the kidneys on arterial branches to supply the vessels, renal glomerulus, and tubules with branches to the ureteric plexus. [1] Some filaments are distributed to the spermatic plexus and, on the right side, to the inferior vena cava.
The adjective renal, meaning related to the kidney, is from the Latin rēnēs, meaning kidneys; the prefix nephro-is from the Ancient Greek word for kidney, nephros (νεφρός). [37] For example, surgical removal of the kidney is a nephrectomy , while a reduction in kidney function is called renal dysfunction .
In human anatomy, the hilum (/ ˈ h aɪ l ə m /; pl.: hila), sometimes formerly called a hilus (/ ˈ h aɪ l ə s /; pl.: hili), is a depression or fissure where structures such as blood vessels and nerves enter an organ. Examples include: Hilum of kidney, admits the renal artery, vein, ureter, and nerves
This fissure is a hilum that transmits the vessels, nerves, and ureter. From anterior to posterior, the renal vein exits, the renal artery enters, and the renal pelvis exits the kidney. On the left hand side the hilum is located at the L1 vertebral level and the right kidney at level L1-2. The lower border of the kidneys is usually alongside L3.
The venous drainage of the kidney large mirrors its arterial supply, except that there are no segmental veins. [4] The stellate veins arise from the capillaries, then drain successively through interlobular veins and interlobar veins until these converge from across the kidney to form the renal vein for that kidney.
The arterial supply of the kidneys is variable and there may be one or more renal arteries supplying each kidney. [1] It is located above the renal vein. Supernumerary renal arteries (two or more arteries to a single kidney) are the most common renovascular anomaly, occurrence ranging from 25% to 40% of kidneys. [8]
The afferent nerves in the kidney are also involved in maintaining balance. Mechanosensory nerves of the kidney are activated by stretching of the tissue of the renal pelvis, which can occur with an increase in the rate of urine flow from the kidney, resulting in a reflex decrease in the activity of efferent sympathetic nerves. That is ...
Postganglionic sympathetic nerves terminating in the kidney release dopamine, which acts on dopamine D1 receptors of blood vessels to control how much blood the kidney filters. Dopamine is the immediate metabolic precursor to norepinephrine, but is nonetheless a distinct signaling molecule. [9]