Numbers and proportions of unmyelinated axons at cervical levels in the fasciculus gracilis of monkey and cat
Article first published online: 26 JAN 2005
Copyright © 1992 Wiley-Liss, Inc.
The Anatomical Record
Volume 232, Issue 2, pages 301–304, February 1992
How to Cite
Garrett, L., Coggeshall, R. E., Patterson, J. T. and Chung, K. (1992), Numbers and proportions of unmyelinated axons at cervical levels in the fasciculus gracilis of monkey and cat. Anat. Rec., 232: 301–304. doi: 10.1002/ar.1092320215
- Issue published online: 26 JAN 2005
- Article first published online: 26 JAN 2005
- Manuscript Accepted: 18 JUL 1991
- Manuscript Received: 23 MAY 1991
The present study is a quantitative analysis of the unmyelinated fiber population in the fasciculus gracilis of the second cervical segment of cat and monkey. We find that unmyelinated fibers represent 13.7% of the total fiber population in this pathway in the cat and 18.9% in the monkey (Macaca fascicularis). The existence of such large numbers of these axons suggests that there may be a sizeable ascending fine primary afferent pathway in the fasciculus gracilis in cat and monkey whose destination is presumably the dorsal column nuclei. These findings are of interest in regard to classic ideas that the afferent fibers in the dorsal columns are large myelinated fibers that convey fine discriminative information to the dorsal column nuclei.