Studies On The Cytoarchitecture And Connections Of The Pallial Thickening In The Lizard Gekko Gecko

The length ,volume,subnucleis of the pallial thickening and morphologyical types,sizes,density of cells in the pallial thickening were studied by Nissl staining,Golgi-cox staining.the connection with other nucleis of the pallial thickening were studied by retrograde tracer horseradish peroxidase(HRP) and fluorescent tracer dextran tetramethylrhodamine, Fluoro-ruby(FR).It will supply morphological and histolgical foundation for elucidating the nuclei'characterists and connections of the visual pathways in gekko gecko of the reptiles.The morphology of the pallial thickening was studied by Nissl staining. the results were demonstrated that pallial thickening lied in the rostral part of the telencephalon , anterior lateral part of the ventricularion,caudal part of the nucleus olfactorius anterior and rostal lateral part of the anterior dorsal ventricular ridge.From the pallial thickening to the tangent point of the telencephalon was close.the length of the pallial thickening was short,the cubage of the nucleus was approximately 0.15mm3.From the rostral part to the caudal part the nucleus extended gradually to max,then died down. The caudal part of the pallial thickening could divide into two parts: dorsal part and ventral part.the length of the Dorsal part was as much as the ventral part .the volume of the Dorsal part was larger than the ventral part.Observed from the transverse sections, dorsal-ventral distance of the dorsal part was longer than the medial-lateral distance of the dorsal part .Moreover, the dorsal-ventral distance of the ventral part was shorter comparatively. The shape and sizes of the two parts were similar. The cell density of the dorsal part was littler than the ventral part.The morphologyical types and sizes of cells in the pallial thickening were studied by Golgi-cox staining. the results were showed that there were different types in the pallial thickening.the round cells were more than half(53.85%).the pyriform cells(28.57%),spindly cell(s8.24%)and erose cell(s9.34%)were not main. The pallial thicking was consisted of large-, medium- and small-diameter neurons. Their percents were 2.2%, 64.28% and 33.52%.The connections of the pallial thickening were studied by HPR and FR. the results were showed that the pallial thickening projected to the rostal lateral part of the anterior dorsal ventricular ridge,dorsal cortex and lateral cortex.It also were projected from the dorsal cortex,lateral cortex,strium and dorsal lateral nucleus.