Srtucture Of Central Complex And The Three-Dimensional Reconstruction In The Cricket Gryllus Bimaculatus

The central complex is a important structure of the insect brain. It’s have thefunction includinglocomotor control, polarization perception and learning andmemory.We had studied central complex whit many insects, make further thethree-dimensional structure of the central complex in the cricket Gryllus bimaculatus，Provide principle on tissue anatomical structure for Behaviour，Hereditism andElectrophysiology.Material and Methods: The three-dimensional structure of the central complex inGryllus bimaculatus was reconstructed after paraffin technique, silver staintechnique，organization structure observation by microscopy technique and thecomputer three-dimensional reconstruction technique.Results:1. Organization structure of the central complex in Gryllus bimaculatusThe central complex is in the middle of the brain and between the mushroombodies in Gryllus bimaculatus. The gross organization of the central complex wasanalyzed through silver stain. Four major neuropils were identified as parts of thecentral complex from anterior to posterior：the protocerebral bridge (PB)，the upperdivision of the central body (CBU)，the lower division of the central body (CBL)，andthe paired nodule (No). Two adjacent structures, the paired lateral accessory lobes(LALs) and the anterior lip（aL），are closely attached to the central complex frontallyand laterally.2.3D structure of the central complex in Gryllus bimaculatusThe upper division of the central body is largest than each other，furthersubdivided into eight horizontal layers；the protocerebral bridge forms a curved，tube-shaped structure. The lower division of the central body is behind the lowerdivision of the central body，pea-like. The noduli form a pair of small，peanut-shapedcompartments attached to the ventral surface of the lower division of the central body.Anterior lip under the upper division of the central body，posterior is the lowerdivision of the central body.Conclusion and discuss: Protocerebrum of Gryllus bimaculatus has the largestproportion, which is the center of connecting and integrating information. Four major neuropils were identified as parts of the central complex: the protocerebral bridge(PB), the upper division of the central body (CBU), the lower division of the centralbody (CBL), and the paired noduli. Two adjacent structures, the paired lateralaccessory lobes (LALs) and the anterior lip, are closely attached to the centralcomplex frontally and laterally.