Studies On Crop Function in the Cockroach (Periplaneta AmericanaL.)

Abstract

The nervous pathway involved in the control of crop-emptying has been worked out by the method of nerve section. This pathway involves nerve 5 from the pharynx to the frontal ganglion, the recurrent nerve, the oesophageal nerve and ganglion, the ingluvial nerve and ganglion Function is not abolished by nerve section between the brain and the frontal ganglion. The sensory end of the pathway is in the pharynx where there is a sense organ which, it is suggested, is an osmoreceptor. A preliminary account of its structure is given.