The extraglomerular mesangial cells help with the signalling between macula densa cells and juxtaglomerular cells.

球外系膜细胞辅助致密斑和球旁细胞的信息传递过程。

Macula densa cells are located in the distal convoluted tubule and they can sense when levels of sodium and chloride are low.

致密斑位于远曲，以感受到钠和氯水平降低。

This is because the part of the occipital lobe in charge of the macula gets blood from both the posterior cerebral artery as well as the medial cerebral artery.

这是因为负责黄斑功能的枕同时由大脑后动脉和大脑中动脉供血。

Ophthalmologists may be the first to consider TSD by finding a " cherry red spot" in the macula of the eye, which results from GM2 buildup in the retinal cells around the central macular area.

眼科医师通过发现眼球黄斑上的" 樱桃红斑" ，而最早考虑Tay-Sachs病；这种斑点是GM2在黄斑中央区周围的视网膜细胞中累积形成的。

So, in the case of hypovolemia and hypotension, the macula densa cells sense the low sodium and chloride levels and send a signal over to the juxtaglomerular cells which are located in the wall of the afferent arteriole.

因此，当血容量减少、低血压时，致密斑感受到钠、氯含量降低，传递信号给位于入球动脉血壁上的球旁细胞。