Fig. 42. An illustration showing the morphology of the 

 cellular elements associated with a blowfly trichoid sensillum. 

 Not all the nervous elements known to be present in such 

 structures have been included in the drawing. Ci, thin-walled 

 hair canal; Cz thick-walled hair canal, within which course 

 the distal fibers {DF) of the sensory neurons (iV); HY, hypo- 

 dermis; TR, TO, trichogen and tormogen cells, respectively. 

 PF: proximal nerve fiber; SP: sensory pore. (After Dethier/* 

 Fig. 2.) 



