Abstract
Nerve fiber counts and the spectral distribution of the myelinated nerve fiber diameters were determined for the vestibular nerve of the White King pigeon. An analysis of variance indicated that the raw data for the utricular, saccular, neglectar, anterior ampullary, and horizontal ampullary nerve branches could be pooled to give an overall unimodal distribution having a mode in the range of 1–2 μm. this could not be done for the posterior ampullary nerve and an intraspecific variation was considered to be the cause of the discrepancy. The utricular nerve had more fibers smaller than 3 μm in diameter (84.9%) than the other branches. Overall, 63.8% of fibers (exclusive of posterior ampullary nerve) were less than 3 μm in diameter. For the individual nerve branches the following average fiber counts ± standard deviations were obtained: 1774 ± 88 for the utricular nerve, 111 ± 243 for the saccular nerve, 86 ± 5 for the neglectar nerve, 1716 ± 142 for the anterior ampullary nerve, 1554 ± 151 for the horizontal ampullary nerve, and 1679 ± 218 for the posterior ampullary nerve. When all branches were combined the average number of fibers was 8720 ± 847 in a diameter range of 1–17 μm.
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