| Abstrakt: |
Response of the sensory epithelium of single ampullae of Lorenzini and spike responses of nerve fibers connected to them to temperature stimulation of the region of the sensory epithelium were studied in experiments on Black Sea skates Raja clavata. Electrically isolated ampullae with input resistance R=500−800 kΩ, to which an external load (a controllable resistance R) could be connected through a feedback circuit, were investigated. Heating the ampulla was accompanied by the appearance of a negative potential in the canal, and other conditions being the same, its magnitude was an almost linear function of the resultant inward resistance of the preparation [R=(R·R)/(R+R)]. The character and intensity of the spike response of the nerve fiber also was determined by the magnitude of R. With a resistance of more than 400-500 kΩ, quickening of spike activity occurred in response to heating, and the degree of quickening increased with an increase in R. With a smaller value of R, the discharge was inhibited, and the inhibition strengthened as the resistance decreased. The presence of two sources of potential, evoked by a change of temperature and giving rise to opposite spike responses, is discussed. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink