Ultrastructure of cell types of the olfactory epithelium in a catfish,Heteropneustesfossilis (Bloch) |
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Authors: | N C Datta Shovan Bandopadhyay |
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Institution: | (1) Fishery and Ecology Research Unit, Department of Zoology, University of Calcutta, 35, Ballygunge Circular Road, 700019 Calcutta, India |
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Abstract: | Transmission electron microscopical study of olfactory epithelium of a mud-dwelling catfish,Heteropneustes fossilis (Bloch) shows receptor, supporting, goblet and basal cells. The receptor cells are of ciliated and microvillous type. Both
ciliated and microvillous receptor cells are provided with olfactory knob. The dendrite of all the receptor cells bears many
longitudinally arranged microtubules. Occurrence of the rod cell and its function is quite debatable. Specialized juctional
complexes between the receptor and adjacent cells are clearly noted. The supporting cells are both ciliated and nonciliated.
The ciliated supporting cells are responsible for water ventilation in the olfactory chamber as well as in the inter-lamellar
spaces. This facilitates better perception of odours by the receptor cells. In addition to providing mechanical support to
other cells, the nonciliated supporting cells also have a secretory function which is evident from the present study. The
different stages of maturity of goblet cells are well documented. The presence of white cells in the olfactory epithelium
is a very rare finding. |
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Keywords: | Catfish olfactory epithelium receptor cell rod cell white cell |
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