位于肾小管曲部邻近肾小球血管极的一面，在断面上 可见细胞排列紧密，核染色较深。
控制肾素合成的机制独立于致密斑本质。
The mechanism in control of renin synthesis is independent of the macula densa.
结果表明，泰和鸡的肾小球旁器由球旁细胞、过渡型致密斑、球外间膜细胞和极周细胞所组成。
The results show: The JGA of Taihe fowl consisted of juxtaglomerular cells, transitional macula densa, extraglomerular mesangial cells and peripolar cells.
肾素的分泌至少受四种互不排斥的机制控制：肾血管受体对向心小动脉壁张力变化的反应； 致密斑受体发现远端肾小管内氯化钠传递速率或浓度的变化；
Renin secretion is controlled by at least four mechanisms that are not mutually exclusive : a renal vascular receptor responds to changes in tension in the afferent arteriolar wall ;
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