An investigation concerning the structure and development of the gustatory organ in fish requires an exemplary object of study, for which the bullhead, i. e. its barbel apparatus, is well suited. Inasmuch as such an investigation relies exclusively on the study of one particular organ, it must be guaranteed that this organ presents conditions which also prevail in other TB-bearing fish organs. Although it may be true that morphology and development of the TB in different fish vary to a certain extent, there is nevertheless sufficient evidence (see below) that the TB system of the bullhead can be considered to be representative of all fish. The barbel system of the bullhead offers such decisive methodological advantages that it was chosen for the present study. The barbels are not only very densely covered with TB, but they also possess an extraordinary capacity for regeneration. For these reasons the formation and differentiation of TB on the epidermis of the developing barbel regenerate are easily observed. In addition, the dimensions of barbel and barbel regenerate offer methodological advantages, since they can be immediately prepared for light microscopical, histochemical, and scanning and transmission electron microscopical purposes. Technically the observation of the sequence of events in developing TB is much easier than would be the observation of embryonal stages, i. e. larval stages in fish, considering the order of experiments employed in the present study.
KeywordsNerve Fibre Basal Cell Schwann Cell Basal Lamina AChE Activity
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