In 186 completely closed cases , a vestige of the synchondrosis was observed as an irregular white line in 91 cases. In 13 cases of them, some part of the sphenoid sinus extended into the occipital bone beyond the vestige.

• 蝶枕软骨结合完全闭合的 186例中 ,可见不规则白线残迹的 91例 ,其中 13例蝶窦超越部分白线累及枕骨 ;