86 THE PHYSIOLOGY OF INSECT SENSES 



cell of Gray). These cells, as Schwabe (1906) observed, are in contact 

 with each other by finger-hke processes and interdigitate with the 

 hypodermal cells by folds. 



The scolopoid body exclusive of its cap is a hollow tube composed 

 of several concentric rods. It lies within the cytoplasm of the envelop- 

 ing cell. The apical body or scolopale cap is an extracellular body lying 



L 



Fig. 61 . Details of the scolopoid region of the tympanic organ of the locust. 

 Cs, scolopoid-cap ; Ci, cilium-like process; Sc, scolopale cell; D, 

 dendrite; A, axon. (Redrawn from Gray, 1960.) 



in a depression of the cap cell and fitted into a rim of the enveloping 

 cell containing the fused ends of the scolopale. 



As the dendrite proceeds from the cell body it presents a ring-shaped 

 dilation just before entering the scolopoid body, a less-pronounced 

 dilation followed by a marked reduction in diameter after it has entered 

 the scolopale, and, finally, a subterminal sweUing. Its tip is inserted 

 into a channel in the cap (Fig. 61). 



The axial fibre which can be seen by light microscopy is shown by 



