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引言用肉眼观察菱形窝底可见第四脑室髓纹常为横行的。国内、外的一些通用的解剖课本皆以此纹做为延髓和脑桥的分界线。Truex 在 Strong 书上则将髓纹横过的部分称作菱形窝的中间部。除了这横行髓纹外,在不同的脑干上,髓纹的进程常有很大变化。Streeter 把髓纹分成平行、集中、分散、横行、斜行和纵行六类。岛田把八种进程的髓纹别为三型。彭庆廉等观察110个国人脑干,把髓纹分为六类,并且同一脑干可有几个类型的髓纹。
Introduction With the naked eye to see the bottom of the fourth ventricle can be seen horizontal lobed rhinoceros. Some common domestic and foreign textbooks are anatomical as the medulla oblongata and pontine demarcation line. Truex in the Strong book will be the part of the medulla crossed by the middle of the diamond nest. In addition to this transverse row of pith, in different brain stems, the process of pith often change greatly. Streeter divided the pith into parallel, concentrated, scattered, rampant, oblique and longitudinal six categories. Shimada eight kinds of process the pith of the three types. Peng Qinglian observed 110 Chinese brainstem, the medulla is divided into six categories, and the same brain stem may have several types of medulla.