The Korean Journal of Physiology
- Volume 24 Issue 2
- /
- Pages.389-402
- /
- 1990
- /
- 0300-4015(pISSN)
Electrophysiological Characteristics of Spinal Neurons Receiving Ventral Root Afferent Inputs in the Cat
척수전근내 구심흥분을 받는 척수신경세포의 생리학적 특성
- Kim, Jun (Department of Physiology, College of Medicine, Seoul National University) ;
- Lee, Suk-Ho (Department of Physiology, College of Medicine, Seoul National University) ;
- Chung, Soon-Tong (Department of Physiology, College of Medicine, Kyung-Hee University)
- Published : 1990.12.30
Abstract
The physiological characteristics of the neurons receiving the ventral root afferent inputs were investigated in the cat. A total of 70 cells were identified in the lumbosacral spinal cord. All these cells responded only to the C-strength stimulation of the distal stump of cut ventral root and the estimated conduction velocities of the VRA fibers were not faster than 4 m/sec. The majority of them were silent in resting state. For 49 cells, their peripheral receptive fields were characterized. Among them, 25 cells were exclusively excited by VRA inputs, 8 were inhibited and the remaining cells recevied both excitatory and inhibitory VRA inputs. According to the response pattern to the mechanical stimuli applied to their receptive fields, only a fourth of them were typical high threshold cell, a sixth, wide dynamic range cells, while remainings were a rather complex cells. Most of the cells receiving VRA inputs, received only the A
Keywords
- Ventral root afferent;
- Spinal neurons;
- Receptive fields;
- Peripheral nerve inputs;
- Morphine;
- Counter irritation;
- Pain