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Four optic nerves obtained from two Lipotes Vexillifer have been studied with the aidof electron microscope. The fiber diameter spectra of all the four optic nerves are unimodal.The diameters of fibers range from 0.35 to 7.45 μm with the highest frequency at 1.5 μm. Ttest indicates there is no significant difference in fiber density and fiber diameter betweenthe central and peripheral regions of the optic nerve. The ratio of axon diameter to thetotal fiber diameter is 0.6 ± 0.02 (p<0.05). The examination of four optic nerves indicatesa mean count of 78,900 fibers; none of unmyelinated fibers have beer seen. The shapesof the cross sections of fibers are very irregular. The myelin sheaths of some nerve fibers arevery thick while those of some others are thinner.
Four optic nerves obtained from two Lipotes Vexillifer have been studied with the aidof electron microscope. The fiber diameter spectra of all the four optic nerves are unimodal. The diameters of fibers range from 0.35 to 7.45 μm with the highest frequency at 1.5 μm. T test indicates there is no significant difference in fiber density and fiber diameter betweenthe central and peripheral regions of the optic nerve. The ratio of axon diameter to the total fiber diameter is 0.6 ± 0.02 (p <0.05). The examination of four optic nerves indicates a mean count of None of unmyelinated fibers have beer seen. The shapes of the cross sections of fibers are very irregular. The myelin sheaths of some nerve fibers are very thick while others of some others are thinner.