Calotes versicolor, the cyto-architecture and anatomy of the neuronal forms of the lizard’s dorsal cerebral cortex, has been examined using the technique of Cresyl violet staining and Golgi impregnation. The lizard dorsomedial cortex has been regarded as homologous to the mammalian hippocampus’ CA3 region because it emits a conspicuous commissural-contralateral projection and because it is the primary recipient of the medial cortex’s zinc-positive “lizard mossy fibres.” Three neuronal layers were seen in the dorsal cerebral cortex. There are only a few neuronal somas in Layer-I and even dendrites ascending from the underlying layers. Three to four cell thick, tightly packed neuronal somas are distinguished by layer-II. There are loosely packed neuronal somas in Layer-III and dendrites and axons descending from Layer-I and II. The ependymal layer just above the ventricle is observed below layer-III. In the cellular layer of the Calotes versicolor dorsal cortex, multipolar neurons, pyramidal neurons, monotufted bipolar neurons, monotufted neurons, bitufted neurons, inverted pyramidal neurons and aspinous bipolar neurons, seven groups of neurons were differentiated using different characteristics such as position criteria, dendritic tree pattern, dendritic spine covering and soma form. With 38.71 percent and 30.65 percent respectively, the dorsal cerebral cortex indicates that the pyramidal and multipolar neurons are dominant, while the aspinous bipolar neurons have just 2.69 percent. There are mostly intracortical dendritic branches and connections in the multipolar neurons. The density of the spine of dendrites of the dorsal cortex ranges from 22.67±8.18 to 30.76±7.64 spines in pyramidal, bitufted and multipolar (moderately spinous) neurons, while it ranges from 10.83±5.64 to 18.18±02.88 spines in bipolar, monotufted and bitufted (sparsely spinous) monotufted bipolar neurons per 25 μm dendritic segment length. The interconnection of neuronal morphology with behaviour needs further lesion regeneration studies.
Dr. Ibrahim D. Sakal
Zoology Department, Science Faculty, Sabratha University, Libya.
Mostafa M. Omar
Zoology Department, Science Faculty, Azzytuna University, Libya.
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