FINE STRUCTURAL OBSERVATIONS OF THE MOLE PANCREAS, WITH SPECIAL REFERENCE TO THE "AUXILIARY STORAGE SAC" IN THE ACINAR CELLS
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概要
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The observations on the fine structure of the mole pancreas have revealed a special structure tentatively named an "auxiliary storage sac" in the acinar cells. This was shown to be a large membranous sphere containing a secretory substance and serving as extra storage. Such storage sacs were freqently observed in the moles captured in summer but in those captured in winter, they were quite few. The cytophysiological significance of the suxiliary storage sac, its possible origins, and the fates were reported and discussed. The islets of Langerhans were composed at least of three types of endocrine cells; glucagon-secreting A-, insulin-secreting B-, and somatostatin-secreting D-cells. A-cells contained electron-dense spherical secretroy granules, and B-cells less electron-dense amorphous secretory granules and/or bar-shaped crystalline grenules. On the other hand, D-cells included less electron-dense amorphous granules usually surrounded by an unclear envelope. The populations of these islet cells were comparable to those of other vertebrate species such as rats, mice and human; B-cells were abundantly distributed at the center of the islets, and a few A-cells were localized at the periphery, whereas D-cells were fewer in number, and usually detected sporadically in the islets. The nervous elements including ganglion cells were observed in the exocrine parts. Some nerve endings reached exocrine and endocrine cells (cholinergic type), while others attained blood vessel walls (adrenergic type). Their function and significance were also discussed.
- 名古屋市立大学の論文
- 1984-07-24