Renal papilla - Definition
Renal papilla is the peak of each renal pyramid which projects into a calyx. It is any of the triangular tissue areas that the medulla (white fatty substance present in the kidneys) is comprised of.
Renal papilla - Location
It is a section of the kidney, either of the two bean-shaped excretory organs that filter urea and other wastes from the blood and excrete them along with water in urine.
Renal papilla - Appearance
The surface of the papilla appears as a sieve and consists of many small openings. Water droplets can pass through these tiny apertures.
Renal papilla - Function
The papilla transports urine from the cortical section of the kidney (the site of urine production) to the calyces. Calyces are cup-shaped cavities wherein the urine gets accumulated prior to its passage through the ureter and into the bladder.
Renal papilla - Disorders
The renal papillae can suffer damage due to some toxic chemicals (nephrotoxins) that are harmful for the kidney and give rise to a condition called 'Renal Papillary Necrosis'. The disease commonly occurs due to dehydration as well as due to usage of non-steroidal anti-inflammatory drugs such as Ibuprofen, Phenylbutazone and Acetylsalicylic acid.
Renal papilla - Pictures
The images below would give you an idea about the appearance of this urinary structure.
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