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DISCHARGE PATTERNS OF RESPIRATORY RELATED NEURONES IN THE MEDIAL AREAS OF NUCLEUS RETROFACIALIS OF MEDULLA

WU ZHONG-HAI, ZHANG FANG-TONG, XU XlAO-YUAN

(Department of Physiology First Military Medical University, Gnangzlwu 510515)

Abstract

Experiments were performed on rabbits and SD rats，both anesthetized with urethane(1 .0 g/kg，iv or ip).Discharges of phrenic nerve and the diaphragmatic muscle electric activities were monitored. Discharge patterns of the respiration-related neurons (RRNs) in the medial area of nucleus retrofacialis (mNRF)were recorded and analyzed. Among the 249 RRNs recorded in the mNRF of the rabbits，118 were inspiratory (I，47. 4%)，91 expiratory (E，36. 5%)，and 40 phase-spanning (PS，16. 1%). Both 1 and E neurons could be further subdivided into 4 subtypes，the PS neurons into E-I and 1-E type. In the 153 RRNs recorded in rats, 68 were I (44. 5肠)，55 E(35.9%)，3 0 PS(19. 6%).It was found that a group of E-I PS neurons that fire preceding phrenic nerve respiratory activity are located in the mNRF，which was believed
to be important in the generation of the basic respiratory rhythm.

Key words: medial area of nucleus retrofacialis;Respiratory neurons;Respiratory rhythm;;

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Citing This Article：

WU ZHONG-HAI, ZHANG FANG-TONG, XU XlAO-YUAN. DISCHARGE PATTERNS OF RESPIRATORY RELATED NEURONES IN THE MEDIAL AREAS OF NUCLEUS RETROFACIALIS OF MEDULLA. Acta Physiol Sin 1997; 49 (4): (in Chinese with English abstract).