Juxtaglomerular apparatus
The prefix "juxta-" comes from the Latin preposition meaning near, nearby, close. The juxtaglomerular apparatus is a collective term referring to the cells near a structure called the glomerulus in the kidney. The juxtaglomerular cells are specialized cells that stimulate the secretion of the adrenal hormone aldosterone and play a major role in renal autoregulation, the kidney's self-governance.

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juxtaglomerular apparatus n a functional unit near a kidney glomerulus that controls renin release and is composed of juxtaglomerular cells and a macula densa

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a complex in the kidney comprising the juxtaglomerular cells, macula densa, and lacis cells of the polkissen; it is the site of tubuloglomerular feedback for autoregulation of the glomerular filtration rate. Called also juxtaglomerular complex.

Medical dictionary. 2011.

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