三维ct能生动地显示锤骨、砧骨的立体形态及空间关系。
D CT can vividly demonstrate the shape and spatial relationships of malleus and incus.
砧骨短脚或砧骨窝及外半规管是乳突手术中确定FN锥曲段的重要标志。
Short limb of incus(or incudal fossa) and lateral semicircular canal are important landmarks by which pyramidal segment of FN might be located in manipulation of mastoid.
充分暴露外半规管轮廓和砧骨窝，保持骨性外耳道后壁的完整。
Outside the full exposition the semicircular canals outline and the anvil nest, maintains the osseous external auditory meatus behind completeness.
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