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左骨迷路・内面
(外側から開く) |
中耳・内耳 |
骨/膜迷路 |
骨迷路 |
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骨/膜迷路と神経 |
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か行 |
か |
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き |
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こ |
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さ行
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し |
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せ |
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た行 |
た |
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ち |
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ら行 |
ら |
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以下は「Wikipedia」の解説文となる。
The vestibule is the central part of the bony labyrinth in the inner ear, and is situated medial to the eardrum (tympanic membrane), behind the cochlea, and in front of the three semicircular canals.
The name comes from the Latin vestibulum, literally an entrance hall.
【Structure】
The vestibule is somewhat oval in shape, but flattened transversely; it measures about 5 mm from front to back, the same from top to bottom, and about 3 mm across.
In its lateral or tympanic wall is the oval window (fenestra vestibuli), closed, in the fresh state, by the base of the stapes and annular ligament.
On its medial wall, at the forepart, is a small circular depression, the recessus sphæricus, which is perforated, at its anterior and inferior part, by several minute holes (macula cribrosa media) for the passage of filaments of the acoustic nerve to the saccule; and behind this depression is an oblique ridge, the crista vestibuli, the anterior end of which is named the pyramid of the vestibule.
【 語 句 】
・bony labyrinth:骨迷路 ・inner ear:内耳 ・eardrum/tympanic membrane:鼓膜 ・cochlea:蝸牛 ・semicircular canals:半規管 ・oval:卵形/楕円形の ・oval window:卵円窓 ・in the fresh state:生体では ・stapes:アブミ骨 ・annular ligament:輪状靭帯 ・recessus sphæricus:球形嚢陥凹 ・perforate:貫通する ・macula cribrosa media:中間篩状斑 ・acoustic nerve:内耳神経 ・saccule:球形嚢 ・oblique:斜めの ・crista vestibuli:前庭稜 ・pyramid of the vestibule:前庭錐体
This ridge bifurcates below to enclose a small depression, the fossa cochlearis, which is perforated by a number of holes for the passage of filaments of the acoustic nerve which supply the vestibular end of the ductus cochlearis.
The orifice of the aquæductus vestibuli is the hind part of the medial wall; it extends to the posterior surface of the petrous portion of the temporal bone.
It transmits a small vein and contains a tubular prolongation of the membranous labyrinth, the endolymphatic duct, which ends in a cul-de-sac between the layers of the dura mater within the cranial cavity.
On the upper wall or roof, there is a transversely oval depression, the recessus ellipticus, separated from the recessus sphæricus by the crista vestibuli already mentioned.
The pyramid and adjoining part of the recessus ellipticus are perforated by a number of holes (macula cribrosa superior).
The apertures in the pyramid transmit the nerves to the utricle; those in the recessus ellipticus are the nerves to the ampullæ of the superior and lateral semicircular ducts.
Behind, the five orifices of the semicircular canals can be found.
In the frontal view, there is an elliptical opening which communicates with the scala vestibuli of the cochlea.
【 語 句 】
・bifurcate:二又に分かれる ・fossa cochlearis: ・ductus cochlearis:蝸牛管 ・orifice:開口部、穴 ・aquæductus vestibuli: ・hind: ・petrous portion: ・temporal bone: ・membranous labyrinth: ・endolymphatic duct: ・cul-de-sac:行き止まり ・dura mater: ・cranial cavity: ・recessus ellipticus:卵形嚢陥凹 ・crista vestibuli:前庭稜 ・macula cribrosa superior:上篩状斑 ・utricle: ・ampullæ: ・scala vestibuli: ・cochlea:
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