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用霍乱毒素亚单位与辣根过氧化物酶结合物（ＣＢ－ＨＲＰ）对脑室系统伸长细胞进行顺行追踪。结果在第三脑室壁腹侧２／３区，大量的伸长细胞发出浓密的突起，对称伸入下丘脑，甚至到达正中隆起腹侧软膜表面，其中部分突起可直接与下丘脑内的血管相接触。在侧脑室壁、第四脑室底和脊髓中央管也发现有伸长细胞，但数量远较第三脑室壁少。本实验表明，伸长细胞不仅存在于第三脑室壁，而且在脑室系统的其他部位也有分布。这一结果提示，伸长细胞的机能可能比以往的认识更复杂。
The cholera toxin subunit and horseradish peroxidase conjugate (CB-HRP) were used to track the ventricular system elongation cells. Results in the third ventricle wall ventral 2/3 area, a large number of elongated cells issued a dense protuberance, extending symmetrically into the hypothalamus, and even reach the median bulge ventral soft membrane surface, some of which can be directly with the hypothalamus within the blood vessels Contact. In the lateral ventricle wall, the fourth ventricle and spinal cord central tube was also found to have elongated cells, but the number is far less than the third ventricle wall. This experiment shows that the elongated cells not only exist in the third ventricle wall, but also in other parts of the ventricular system are also distributed. This result suggests that the function of elongating cells may be more complicated than previously known.