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Juxtaglomerular apparatus

Recommended video: Kidney histology [33:48]
Have a thorough look at the microscopic structure of the kidney and its cell types.

The juxtaglomerular apparatus (JGA), also referred to as the juxtaglomerular complex, is a specialized region of the nephron formed by three different types of cells: macula densa, juxtaglomerular granular, and extraglomerular mesangial (Lacis) cells. The tightly packed macula densa is situated at the transition between the ascending limb of the nephron loop and the distal tubule, where it comes into contact with the juxtaglomerular granular cells, which are modified smooth muscle cells in the afferent (and sometimes efferent) arteriole. Enclosed in the triangular space between the afferent and efferent arteriole and the macula densa of the distal tubule are the extraglomerular mesangial cells

The JGA functions to regulate systemic blood pressure and glomerular blood flow and filtration rate.

Terminology English: Juxtaglomerular aparatus
Latin: Complexus juxtaglomerularis
Definition Region of the nephron formed by the macula densa, juxtoglomerular granular cells and extraglomerular mesangial cells 
Function Regulates blood pressure and glomerular filtration rate

Learn more about the histology of the kidneys with this study unit (and article):

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