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在三个成人脑干先见第四脑室髓纹一侧偏大,经过染片研究,发现以下的情形。一侧偏大的髓纹与对侧弓状核的偏大是相繋的。在偏大的弓状核中,纤维聚向正中裂底,大束纤维循缝际行向背侧,陆续越边,自室底中線折向外侧,遶过听结节,接近小脑。除了弓状主核,前外侧的副核、缝际核前部似也参加髓纹的合成。室底外侧部的零散核团也收发髓纹纤维。弓状核和连属的核团是脑桥核的下延部分。髓纹相当向下移位的脑桥臂纤维,是傅向小脑的。弓状核的纤维除形成髓纹外,一部进入同边和对边的前外弓状纤维,遶行延髓前外面,似趋奔小脑。
In the three adult brain stem fourth ventricle preoccupied side is large, after the dye study found the following situation. Large side of the medulla and the contralateral arcuate nucleus is large relative to the system. In the larger arcuate nucleus, the fibers converge to the median fissure, large bundles of fibers to the back dorsal line, one after another edge, from the midline to the lateral fold, bypassing the auditory nodules, close to the cerebellum. In addition to the arcuate main nucleus, anterolateral anterior nucleus, stitched nucleus anterior also seems to participate in the synthesis of medulla. Scattered nuclei in the lateral part of the floor also receive myofibers. Arcuate nuclei and contiguous nucleus is the nucleus of the pontine extension. Medullary quite downward shift of the pons arm fibers, Fu to the cerebellum. In addition to the formation of arcuate arcuate nucleus fibers, one into the same side and opposite the anterolateral arcuate fibers, around the front of the medulla oblongata, seems to go straight to the cerebellum.