[Distribution of sensory fibers of the extremities in the neuropile of the abdominal chain of Eurygaster integriceps].

Sensory neuropile of the extremities has been studied in series sections and total preparations from E. integriceps. Extremity nuclei are fairly well distinguished from the rest neuropile. Only terminal sensitive fibers enter the nucleus through the sensory root of the nerve. The main bulk of fibers is divided into two branches. With respect to the branching pattern, terminal fibers of the insect studied are similar to typical fibers of the sensory neuropile in the dragonfly, locust, and cricket. It is suggested that the sensory neuropile of the extremities in all insects occupies the same position and is composed by similar nervous elements. Differences concern the extent of development and differentiation of the nuclei, being associated with peculiar functions of the extremities in the given insect.