英语语法分析

The optic canal protrudes into ethmoidal and sphenoid sinuses.

内侧壁向筛窦、蝶窦内突入形成视神经管隆凸。

Objective To explore the significance of ethmoidal artery in operation of ethmoidal sinus.

目的探讨筛动脉在筛窦手术中的意义。

If it affects the paranasal sinuses, it most commonly involves the ethmoidal and maxillary sinuses.

如果累及副鼻窦，最常见的是累及筛窦及上颌窦。