NERVOUS SYSTEM 



475 



On either side of the tritocerebral central body, there is a giant cell which gives rise 

 to the giant fibre c. This crosses in the tritocerebral commissure to the other side of 



BASAL 

 GANGLION 

 OF 

 [TENNA 



Fig. II. Semi-diagrammatic view of section through base of antenna to show the antennal basal ganghon, 

 antennal artery, the giant fibre system of the antenna (green) and the antennal gland. ( x 300 approx.) 



the body and, after bending slightly backwards, curves for\vards to end in an arboriza- 

 tion in the antennal motor nucleus. 



A pair of giant fibres d extend forwards from the antennal motor nucleus, and cross 

 each other just in front of the frontal aperture of the brain. Each fibre at once bifurcates, 



