The tympanomastoid fissure is lateral to the stylomastoid foramen, between the tympanic part and the mastoid process, for the auricular branch of the vagus.
【 語 句 】
・stylomastoid foramen:茎乳突孔 ・tympanic part:鼓室部 ・mastoid process:乳様突起 ・auricular branch of the vagus:迷走神経の耳介枝