They occur when there is a breakdown in the integrity of the corneal epithelium .

该情况发生于角膜上皮的完整性受到破坏时。

Bright green , neural retina ; off green , pigment epithelium ; blue , nuclei ; red , active myosin ( strong in the inner surface of pigment epithelium ) .

亮绿色，神经视网膜；灰绿色，色素层细胞；蓝色，神经核；红色，活化肌球蛋白（在色素层细胞的内表面更丰富）。

Fluorescein staining reveals the characteristic dendritic pattern of ulcers which represent areas of denuded corneal epithelium .

荧光素染色可发现特征性的树枝形状溃疡，染色区域的角膜上皮脱落。

The human nose contains a postage stamp-size smelling organ , called the olfactory epithelium , at the roof of the nasal cavity .

人类鼻腔的屋顶，有一块面积如邮票大小被称之为“嗅上皮”的嗅觉器官，

Pooling together 801 neural recordings from people 's noses , the team found that some regions of the epithelium are better at detecting scent than other regions .

从对人体鼻腔收集到的801项神经活动记录来看，小组人员发现某些区域的嗅上皮细胞比其它区域的对某种气味更具感知能力。