筛骨组成颅骨的29块骨骼之一。共一块。位于两眶之间，额骨的下方，被其他骨骼包围着，无法直接看到。其后方为蝶骨。外观为为巾字形，分为筛板、垂直板和筛骨迷路三部。

• 人体骨骼列表

The ethmoid bone (/ˈɛθmɔɪd/; from Greek ethmos, "sieve") is an unpaired bone in the skull that separates the nasal cavity from the brain. It is located at the roof of the nose, between the two orbits. The cubical bone is lightweight due to a spongy construction. The ethmoid bone is one of the bones that make up the orbit of the eye.