囟脑门 Traditional form: 囟腦門 Pinyin (reading): xìnnǎomén Definitions: fontanel (gap between the bones of an infant's skull) Characters: 囟 - top of the head; skull 脑 - brain 门 - gate, door, entrance, opening Traditional characters: 囟 - top of the head; skull 腦 - brain 門 - gate, door, entrance, opening