Ehrlich D, Mills D
Cell Tissue Res. 1985;239(3):661-6. doi: 10.1007/BF00219246.
By use of light- and electron microscopy the anterior commissure of the chick was studied at different times during development. Between the 19th day of incubation and the 35th day after hatching the cross-sectional area of the anterior commissure, as determined from mid-sagittal sections, undergoes a 6-fold increase in size. Thereafter the area remains fairly constant. The total number of fibres in the anterior commissure was estimated to be 89000. The full complement of fibres is already present by the 19th day of incubation. Myelogenesis occurs mainly between the 19th day of incubation and the 35th day after hatching, concomitant with the increase in cross-sectional area. From the 35th day after hatching, myelinated fibres comprise approximately 40% of the total number of fibres. The median diameter of unmyelinated fibres is about 0.35-0.40 micron. The median diameters of myelinated axons and fibres are 0.8-1.0 micron and 1.1-1.3 micron, respectively.
利用光学显微镜和电子显微镜，对雏鸡前连合在发育过程中的不同时期进行了研究。从孵出第19天到出壳后第35天，根据正中矢状切面测定，前连合的横截面积增大了6倍。此后，该面积保持相当稳定。前连合中的纤维总数估计为89000条。在孵出第19天时，纤维的全部数量就已存在。髓鞘形成主要发生在孵出第19天到出壳后第35天之间，与横截面积的增加同时出现。从出壳后第35天起，有髓纤维约占纤维总数的40%。无髓纤维的中值直径约为0.35 - 0.40微米。有髓轴突和纤维的中值直径分别为0.8 - 1.0微米和1.1 - 1.3微米。
