noun
sphenoid bone
Anatomical term for the butterfly-shaped bone at the base of the skull.
蝶形骨は頭蓋骨の底部にある。
The sphenoid bone is located at the base of the skull.
Standard kanji spelling for the sphenoid bone.
Mixed kanji-kana spelling; less common but still encountered.
From 蝶形 (butterfly-shaped) + 骨 (bone), referring to its shape.