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颈动脉体化学感受器在呼吸和循环调节方面起重要作用,它感受血液中化学成分、温度及渗透压的变化,并将这些变化转变为电信号,通过窦神经传入脑干呼吸中枢和心血管中枢,对呼吸和循环发挥调节作用。颈动脉体的实质细胞团分布在丰富的血管网中,实质细胞分为两型,即Ⅰ型细胞和Ⅱ型细胞,并有神经末梢与Ⅰ型细胞联系形成突触。Ⅰ型细胞在颈动脉体的化学感受过程中起重要作用,对于Ⅰ型细胞是否可进一步分成亚型,曾有过报道,但未获一致结论。电镜下Ⅰ型细胞呈圆形、椭园形或多角形,直径约5～10μm,细胞核常
Carotid body chemoreceptors play an important role in respiratory and circulatory regulation by sensing changes in blood chemistry, temperature, and osmotic pressure, converting these changes into electrical signals, passing through the sinus nerves into the brainstem respiratory center and cardiovascular Central, on the respiratory and circulatory play a regulatory role. The carotid body parenchyma cell mass distribution in the rich vascular network, parenchymal cells are divided into two types, namely type Ⅰ cells and type Ⅱ cells, and nerve endings associated with type Ⅰ cells to form synapses. Type I cells play an important role in the chemosensory process of carotid body. Whether type I cells can be further divided into subtypes has been reported before, but no consensus conclusion has been reached. Type I cells under electron microscopy were round, oval or polygonal, about 5 ~ 10μm in diameter, often nuclear