THE INTERNAL ANATOMY OF INSECTS 



107 



III. THE ALIMENTARY CANAL AND ITS APPENDAGES 



a. THE MORE GENERAL FEATURES 



The alimentary canal is a tube extending from one end of the body 

 to the other. In some larvae, its length is about the same as that of 

 the body; in this case it extends in a nearly straight line, occupying 



ba. 



a JCWITT.SO 



Fig. 124. Internal anatomy of a cockroach, Periplaneta orientalis; a, antennae; 

 Oil h, 63, first, second, and third legs; c, cerci; d, ventricular ganglion; e, 

 salivary duct; /, salivary bladder; g, gizzard or proventriculus; h, hepatic 

 cceca; i, mid-intestine; ;, Malpighian vessels; k, small intestine;^ /, large 

 intestine; m, rectum; n, first abdominal ganglion; o, ovary; p, sebaceous 

 glands (From Rolleston). 



