Abstract
ABSTRACT Many insects possess two or three dorsal ocelli in addition to the paired compound eyes. The dorsal ocellus is characterized by a high convergent ratio of many retinular axons upon several thick second-order neurones in the posterior region of the ocellus. The thick second-order neurones extend towards the brain as an ocellar nerve together with other thin processes, and their central projections have been well demonstrated by cobalt backfills in many insects (reviewed by Goodman, 1981). However, our knowledge about how information is processed in the ocellar system is limited (but see Chappell & Dowling, 1972; Wilson, 1978a,b; Goodman, 1981; Simmons, 1981). In the present study we present some evidence that in the cockroach, Periplaneta americana, the ocellar second-order neurones function as CNS integrative multimodal neurones.
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