第四脑室的顶部，于延脑的高度有一个 正中孔 （ Median aperture ）、于桥脑的高度有二个外侧孔（Lateral apertures），经由这三个孔而使第四脑室与蜘蛛膜下腔相通。
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共行肌皮神经缩窄11例，正中神经缩窄15例，胫神经缩窄37例，闭孔神经缩窄6例，坐骨神经缩窄11例，腓深神经缩窄2例。
The neurotomies include 11 musculocutaneous nerves, 15 median nerves, 37 tibial nerves, 6 obturator nerves, 11 sciatic nerves, 2 profound peroneal nerves.
直接朝着孔的正中心吹气似乎效果最好。
My breath directly into the center of the hole seems to work best.
结果：单一钛小夹板沿中线固定下颌角区、体部颏孔区及正中联合区骨折骨断端均产生较大的弯曲及扭转移位。
Results: a large bending and torsion displacement was founded in Angle, body and symphyseal fracture fixed by a single titanium mini-plate along the middle line.
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