The inferior surface of sphenoid bone presents, in the middle line, a triangular spine, the sphenoidal rostrum, which is continuous with the sphenoidal crest on the anterior surface, and is received in a deep fissure between the alæ of the vomer.
【 語 句 】
・sphenoidal crest:蝶形骨稜 ・fissure:裂け目 ・alae of the vomer:鋤骨翼