Receptive field properties of chronically compressed DRG neurons with and without SA, determined in vivo
| Modality | Non-SA | Type I SA | Type II SA | SA% |
|---|---|---|---|---|
| Non-nociceptive | ||||
| MS | 73 | 11 | 4 | 17.0% |
| ALTM-RA, hair. | 32 | 1 | 1 | 5.9% |
| ALTM-RA, glab. | 19 | 2 | 9.5% | |
| ALTM-SA | 13 | 0.0% | ||
| Nociceptive | ||||
| AHTM | 13 | 1 | 7.1% | |
| CHTM | 6 | 0.0% | ||
| Unknown | ||||
| A-type | 35 | 1 | 1 | 5.4% |
| C-type | 13 | 1 | 7.1% | |
| Total | 204 | 15 | 8 | 10.1% |
The table provides the number of neurons of each sensory modality (or unknown modality) that was silent (Non-SA) or exhibited type I SA or type II SA (the SA% representing the total percentage of neurons with SA). MS, Muscle spindle; ALTM-RA, ALTM-SA, A-type low-threshold mechanoreceptor, rapidly adapting and slowly adapting, respectively; hair., hairy skin; glab., glabrous skin; AHTM, CHTM, A-type and C-type high-threshold mechanoreceptor, respectively. Because the primary method of searching for receptive fields was mechanical stimulation, our samples were biased toward mechanosensitive nociceptors. AHTMs and CHTMs also included those that responded to nociceptive heat and/or cold stimuli.