64 
NERVOUS SYSTEM. 
impressions on both sides of the body. Other fibres 
are called reflex. As these come in contact with the 
ganglion cells and return, the impressions produced 
are reflected back and not conveyed to the other 
ganglia or the brain. 
The ganglionic chain, according to Brandt, by 
whom it has been specially studied, consists of the 
supra-oesophageal ganglion (Fig. 29, a), which supplies 
the nerves to the compound eyes (^), the ocelli, the 
antennae and labrum ; the sub-oesophageal (/), which 
is connected to it by the collar {g), those of the jaws, 
labium, and the palpi. The first ganglion in the 
thorax (the pro-thorax, b) supplies those of the two 
anterior legs. The next two (c) unite, although they 
act independently of each other, the upper one send- 
ing its nerve fibrils towards the anterior wings and 
middle legs, whilst the lower one is in connexion with 
the posterior wings and legs. 
The abdominal ganglia, of which there are five in 
the worker and only four in the drone and queen. 
Fig. 30. — Nerves and 
Ganglionic Cells. 
Ganglionic and Nervous 
Cords. 
