Pulmonary neuroendocrine cell (PNEC) system consists of solitary cells and innervated clusters, neuroepithelial bodies (NE, widely distributed throughout the airway mucosa of mammalian lungs.

• 肺神经内分泌细胞（PNEC）系统由单独的细胞、分布神经丛和神经上皮小体组成，广泛地分布于哺乳动物肺脏的气道粘膜。