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Journal of Dental Research
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Axon Populations in Cat Lingual and Chorda Tympani Nerves

G.R. Holland

Department of Restorative Dentistry, University of Alberta, 3014 Dentistry Pharmacy Centre, Edmonton, Alberta, Canada T6G 2N8

P.P. Robinson

Department of Oral and Maxillofacial Surgery, University of Sheffield, Charles Clifford Dental Hospital, Wellesley Road, Sheffield S10 2SZ, United Kingdom

The lingual and chorda tympani nerves from five cats were examined so that normal axonal populations could be determined. After perfusion fixation, the chorda tympani and lingual nerves were removed and processed, and sections were taken from individual and combined nerves for both light and electron microscopy. The chorda tympani remained as a distinct group of smaller axons for at least 4 mm distal to its junction with the lingual nerve. The mean number ± S.D. of myelinated axons in the chorda tympani central to the junction was 1322 (± 268) and in the lingual nerve central to the junction, 3227 (± 510). The counts were not significantly different distal to the junction, and there were no side-to-side differences. Mean myelinated axon circumferences were significantly smaller in the chorda tympani (12.86 ± 0.87) than in the lingual nerve (22.79 ± 1.99; p < 0.01). The mean size of axons in the chorda tympani was slightly but consistently larger on the left (13.1 ± 0.73) than on the right side (12.61 ± 1.01; p < 0.05). Distal to the junction, the average proportion of non-myelinated axons was 44% in both chorda tympani and lingual nerves.

Journal of Dental Research, Vol. 71, No. 8, 1468-1472 (1992)
DOI: 10.1177/00220345920710080201
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G.R. Holland, D. Andrade, K.G. Smith, S. Lahl, P.P. Robinson, and E. Pehowich
A Quantitative Morphological Comparison of Cat Lingual Nerve Repair Using Epineurial Sutures or Entubulation
Journal of Dental Research, March 1, 1996; 75(3): 942 - 948.
[Abstract] [PDF]