Textbooks, she said, describe the roots of the stereocilia ending in the cuticular plate
missing) if no stereocilia and cuticular plate
These hardened cuticular plates
, acting as deflectors, are located just outside the opening of the reaction chamber, and give directional control to the discharge by changing their angle of deflection.
In insects which feed on solid food, the inner wall of the proventriculus becomes armed with strong cuticular plates
or teeth which grind the food (Snodgrass 1935).