On the pituitary gland of some Japanese elasmobranchiate fishes
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概要
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The morphology, histology and the sub-division of the pituitary gland of seven species of Japanese elasmobranchiate fish were described in this paper. And the following results were obtained.<BR>1. The pituitary gland of the elasmobranchiate fish consists of four components as is the case with the higher vertebrates essentially. They are the pars anterior, which is subdivided into (1) the pars tuberalis and (2) the pars principalis, (3) the pars intermedia and (4) the pars nervosa respectively. In <I>Raja</I>, however, the pars anterior is divided into four parts, and so called the "ventral lobe" (the pars ventralis) is well developed. Although the pars ventralis is a elongate part of the pars anterior, but not homologous to the pars tuberalis of others.<BR>2. The general structure of the pituitary of the elasmobranchiate fish is more similar to the pituitary of the cyclostomata rather than that of the teleost.<BR>The pars intermedia lies in the most posterior part, and occupies largest area of the pituitary. On the contrary, the development of the pars nervosa is very poor, forming merely an elongation and expansion of the infundibulum, and it lies in the dorsal roof of the glandular parts. However, in <I>Raja</I> the pars nervosa is surrounded by the pars intermedia, and these two parts make up so called the "neuro-intermediate lobe."<BR>3. In the young fish the pars anterior is constructed from the cord of the columnar cells, while in the adult fish these cells are arranged in the follicles.<BR>In general the part which homologous to the pars tuberalis and also the pars principalis composed of the basophiles and the acidophiles respectively only with the exception of <I>Dasyatis</I> in which the reversal of the chromophilic nature of the cells is recognized. The pars ventralis of <I>Raja</I> consists of the convoluting cord of the basophiles. In the pars intermedia the acidophiles arranged in the remarkable convoluting cord commonly, but in <I>Dasyatis</I> the basophiles are recognized in this part.
- 日本魚類学会の論文
日本魚類学会 | 論文
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