Abstract
1. 29% of the axons in the S3 and Ca 1 caudal ventral roots of the cat are unmyelinated. 2. Approximately one half of these unmyelinated axons survive in the proximal stump of a sectioned ventral root and are regarded as unmyelinated preganglionic efferents. 3. At least 27% of the preganglionic efferents in segments S3 and Ca 1 are unmyelinated. 4. The other half of the ventral root unmyelinated axons arise from dorsal root ganglion cells and survive in the distal stump of a sectioned ventral root. 5. The data in 4, combined with the receptive field data in our companion paper, show that these unmyelinated fibres are sensory. 6. Since 15% of the ventral root axons are sensory, the Law of Bell and Magendie cannot be regarded as an accurate description of the organization of these ventral roots.
Original language | English (US) |
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Pages (from-to) | 557-572 |
Number of pages | 16 |
Journal | The Journal of Physiology |
Volume | 256 |
Issue number | 3 |
DOIs | |
State | Published - Apr 1 1976 |
Externally published | Yes |
ASJC Scopus subject areas
- Physiology