STRUCTURE OF EAR. 



103 



It is well shown in Fig. 65, taken from Graber. At 

 the upper part of the ganglion is a group terminating 

 below in a single row of vesicles, the first few of which 



Fig. 65.— The trachete and nerve-end organs from the tibia (\cg) of a grasshopper 

 (Ephippjgera vitium) ; after Graber. EBI, Terminal vesicles of Siebold's organ ; 

 hT, hinder tympanum ; Sp, space between the tracheae ; hTi\ hinder branch of the 

 trachea; SN, nerves of the organ of Siebold; go, supra-tympanal ganglion; 

 Gr, group of vesicles of the organ of Siebold ; vN, connecting nerve-fibrils between 

 the ganglionic cells and the terminal vesicles ; So, nerve terminations of the organ 

 of Siebold ; vT, front tympanum ; vTr, front branch of the trachea. 



are approximately equal, but which subsequently 

 diminish regularly in size. Each of these vesicles is 

 connected with the nerve by a fibril (Fig. Qb, vN), and 

 contains an auditory rod (Fig. Q6). 



