Morphology and quantification of juxtaglomerular cells of the chicken kidney.

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Abstract
Morphology and distribution of the juxtaglomerular (JG) cells of chicken kidneys were ontogenetically studied by light microscopy and EM. JG cells contained fine secretory granules having a diameter of about 350 nm and myofibrils in their cytoplasm. Three types of JG cells were classified tentatively by their positions for the convenience of description: A type, located at the walls of the glomerular arterioles; V type located at the paravascular poles; and M type, located in the mesangial regions. There were no morphological differences among the granular characteristics of the 3 types of JG cells, but some JG cells of M type showed obscure assocation with neighboring basement membranes of glomerular capillaries and contained almost no myofibrils in their cytoplasm. Ontogenentically, JG cells were initially detected in embryos of 19 days of incubation, and their histoplanimetrical frequency was increased until the 1st day of posthatching life. However, a prominent decrease in the frequency was characteristically estimated at the 2nd posthatching day. Thereafter, their relative histoplanimetrical values were tended to increase constantly. Concerning the frequencies estimated among the 3 types of JG cells for the period of 1-15 posthatching weeks, the relative frequency of the glomeruli containing A type of JG cells was clearly decreased in contrast with that of M type. Relative histoplanimetrical values did not change conspicuously in the glomeruli containing V type of JG cells throughout the investigated period.

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