In:
Bulletin de la Classe des sciences, PERSEE Program, Vol. 72, No. 1 ( 1986), p. 62-72
Kurzfassung:
The light microscope observations on the oesophagus and the buccal cavity of the African (Schübe mystus L.) and the Asian (Pangasius micronemus BLKR.) freshwater catfishes revealed that the stratified squamous epithelium was made up of three kinds of cells. Two cell-types are well-known, e.g. undifferen¬ tiated and mucus-secreting cells. The third cell-type («barrel-shaped») was abundant and of an unusual giant size (25-30μm x 15-20 μm). These cells were not mucoid in nature. In contrast they stained reddish-brown with the coupled tetrazonium method according to DANIELLI, which allows the authors to ensure their protein content. Furthermore their particular binding of fluorescent lectin from Arachis hypogaea (PNA) indicated that ß-D-galactosyl residues were abundant in the cytoplasm. The occurence of similar cells (club cells) in the skin of both siluroid and cyprinoid fishes is well documented. They were claimed to be involved in alarm substance secretion. Their presence, however, in the oesophageal and buccal mucosa has never been reported. Thus, the present work embodies an original observation on the histology of the anterior part of the alimentary tract of the catfishes. Since scientists regard the main role of buccal cavity and oesophagus as gustation and mucus production, the function of these giant cells in this part of the alimentary tract remains conjectural.
Materialart:
Online-Ressource
ISSN:
0001-4141
DOI:
10.3406/barb.1986.57561
Sprache:
Französisch
Verlag:
PERSEE Program
Publikationsdatum:
1986
SSG:
11
