Abstract
The olfactory organ of Channa punctata (Bloch) has been studied under light microscope and transmission electron microscope. The olfactory apparatus of C. punctata comprises of olfactory rosette, olfactory nerve, and olfactory bulb. Paired, oval shaped olfactory rosette present in the olfactory chamber on fish rostrum. Olfactory chamber opens externally via an anterior inlet and a posterior nostril outlet. Olfactory epithelium comprises of sensory and non-sensory regions. Sensory region is at basal part and non-sensory region is at proximal area of olfactory lamellae. In olfactory lamellae, sensory epithelium consists of olfactory receptor cells, supporting cells, basal cells, goblet cells, mucous cell and white cell. Olfactory receptor cells are of two types microvillous and ciliated. In C. punctata, olfactory bulb is sessile and is attached to the telencephalon. Cells of olfactory bulb are organized in four concentric layers. Outer layer is olfactory nerve layer formed by axons of olfactory receptor cells. Inner to it is glomerular layer where axons of olfactory receptor cells synapse with dendrites of mitral cells. Next towards deeper part is mitral cell layer which comprises larger multipolar mitral cells. Central core is formed by granular cell layer with small granular cells.
Highlights
The olfactory system brings about responses to a mass of different stimuli vital for the interaction of an organism with its surrounding environment as well as with congener
The stimuli are identified by receptor cells with odorant receptors and the information is transmitted to the olfactory bulb [1]
The structure of the olfactory epithelium in fishes have been investigated by several researchers revealing remarkable diversity exist regarding the shape, number, and arrangement of the olfactory lamellae, the distribution of sensory and non-sensory epithelium as well as variations in olfactory receptor cells in different teleosts [2,3,4,5,6,7]
Summary
The olfactory system brings about responses to a mass of different stimuli vital for the interaction of an organism with its surrounding environment as well as with congener. The stimuli are identified by receptor cells with odorant receptors and the information is transmitted to the olfactory bulb [1]. Number of investigators has been earlier described the structure of the olfactory organ in the teleostean fishes. The teleostean olfactory organ exhibits various variations due to differences in habit and habitat. The structure of the olfactory epithelium in fishes have been investigated by several researchers revealing remarkable diversity exist regarding the shape, number, and arrangement of the olfactory lamellae, the distribution of sensory and non-sensory epithelium as well as variations in olfactory receptor cells in different teleosts [2,3,4,5,6,7]. Surface ultrastructure of olfactory epithelium studied in C. punctata [4], cellular ultrastructure of olfactory epithelium and olfactory bulb is not yet explored. The present study is an attempt to examine the histology with the help of light microscope (LM) and transmission electron microscopic (TEM) structure of the olfactory epithelium and olfactory bulb of spotted snake head C. punctata
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