The wind-sensitive cercal receptor/giant interneurone system of the locust,Locusta migratoria. I. Anatomy of the system

摘要: 1. The terminal ganglion ofLocusta migratoria contains a number of non-giant, wind-sensitive, ascending and local interneurones. Six (Figs. 1, 2) 6 6, 7) interneurones have been identified morphologically on the basis intracellular stains with Lucifer Yellow. 2. The physiological responses various cell types were recorded as cerci exposed to sound, wind, or electrical stimulation 3, 8). Some cells summate input from both (Fig. 3), while others are excited by one side inhibited other Conduction velocities for several non-giant range 1.5 m/s (cell 1) −2.1 25). 3. The morphologies giant (GIN (cells la, b) somata in cluster 1 neuromere 9 compared using simultaneous recordings 2A, 4). These neurones very similar dendritic arborizations 4A, B), respond almost identically cercal 4Ci), but there do not appear be any connections GIN 4Cii, iii). 4. The morphology 5A, C), response wind 5B) nongiant interneurone its soma segment 8 5), those such 9. 5. Of all except 9) bilateral which may extend over neuromeres within 10, 22). Several 5, 9, 24) produce action potentials 8, 10) injection depolarizing current 11). 6. Simultaneous pairs demonstrate that giants locals 2/cell 5; 1/cell 9), well different 24/cell receive same wind-sensitive filiform afferent 9). 7. Local 5 22 gross 7, 10). Cell however, has projecting into posterior glomeruli 7 A, inset), whereas only ipsilateral branches posteriorly glomerulus 10C). Physiologically, is depolarized directed at 10 A), mainly cercus does does. 8. Cell occurs pair 7B, inset; 11). Simultaneous homologues show they share least 11D), no between them 11E). penetrations short-latency excitatory connection 3 12 long-latency 2 5. 9. The roles transmitting information thoracic motor centres discussed.