Dehiscence of the floor of the hypotympanum with protrusion of the jugular bulb into the middle ear cavity is a rare otological finding.
颈静脉球经下鼓室底部骨层裂隙膨入中耳腔，是一种罕见的中耳腔血管异常。
2
Objective To provide applied anatomic data for the microsurgery of hypotympanum and infralabyrinthine by studying the shape and variation of hypotympanumic sinus.
目的研究下鼓室窦的形态及变异，为下鼓室及迷路下显微外科手术提供应用解剖学资料。
3
Objective To explore the variable relationship among carotid canal, jugular pit and hypotympanum to provide applied anatomic data for the operations of jugular pit and hypotympanum region.