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| 右内耳道底 |
内耳道底と神経 |
左側頭骨（内側面） |
右耳（前面） |
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| 右側頭骨（上面）
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聴覚・模型図 |
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以下は「IMAIOS」の解説文となる。
「The fundus of internal acoustic meatus is the lateral end of the internal acoustic canal.
It is closed by a vertical plate, which is divided by a horizontal crest, the transverse crest (falcifom crest, crista falciformis), into two unequal portions. Each portion is further subdivided by a vertical ridge into an anterior and a posterior part. In the portion beneath the crista falciformis are three sets of foramina; one group, just below the posterior part of the crest, situated in the inferior vestibular area (area cribosa media), consists of several small openings for the nerves to the saccule; below and behind this area is the foramen singulare, or opening for the nerve to the posterior semicircular duct; in front of and below the first is the tractus spiralis foraminosus, consisting of a number of small spirally arranged openings, which encircle the canalis centralis cochleæ; these openings together with this central canal transmit the nerves to the cochlea. The portion above the transverse crest presents behind, the superior vestibular area (area cribrosa superior), pierced by a series of small openings, for the passage of the nerves to the utricle and the superior and lateral semicircular ducts, and, in front, the facial area (area facians), with one large opening, the commencement of the canal for the facial nerve (aquæductus Fallopii). 」
【 語 句 】
・internal acoustic canal：内耳道 ・transverse crest：横稜 ・ridge：隆起(線) ・foramina：孔 ・inferior vestibular area：下前庭野 ・saccule：球形嚢 ・foramen singulare：単孔 ・posterior semicircular duct：後半規管 ・truct spiralis foraminosus：ラセン孔列 ・canalis centralis cochlear：？ ・cochlea：蝸牛 ・superior vestibular area：上前庭野 ・pierce：貫通する ・utricle：卵形嚢 ・facial area：顔面神経野 ・commencement：始まり
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