164 



Beekeeping 



which the stomatogastric system (sympathetic system) 

 has its origin (StgNv). The suboesophageal ganglion gives 

 off nerve branches to the mandibles (MdNv), maxillae (MxNv) 

 and labium (LbNv). For a study of the minute structure of 

 the brain and the paths of the various nervous elements, the 

 reader is referred to the works of Kenyon l and Jonescu. 2 



SoeGng-' 



FtCom 

 StgNv 



Nv 

 MxNv 

 MdNv 



LmN 



FIG. 85. Brain and suboesophageal ganglion of worker, anterior view. 



In the thorax the number of ganglia is reduced to two 

 (Figs. 78 and 84, iGng and 2Gng}. The first innervates the 

 first pair of legs while the second is a combination of four 

 ganglia, as shown by the fact that it innervates the meso- 



1 Kenyon, F. C., 1896. The brain of the bee. Jr. comp. neurol., VI, 

 pp. 133-210. 



, 1897. The optic lobes of the bee's brain in the light of recent 



neurological methods. Am. nat., XXXI, pp. 369-376. 



2 Jonescu, C. N., 1909. Vergleichende Untersuchungen tiber das 

 Gehirn der Honigbiene. Jenaischen Zeit. f. Naturwiss., XLV, N. F., 

 XXXVIII. 



