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| 11. |
Histological changes following unilateral re-innervation of the circumvallate papilla of rat |
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Cells Tissues Organs,
Volume 98,
Issue 3,
1977,
Page 343-352
Fathy A. State,
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摘要:
The present work was designed to study the histological changes of the rat’s circumvallate papilla following unilateral glossopharyngeal re-innervation. Unilateral re-innervation was achieved by transection of the 9th nerve and avulsion of its central segment on the right side and crushing that of the left side. The latter was thus allowed to regenerate and to re-innervate the papilla. On the first 2 post-operative weeks, the nerve bundles at the base of the papilla and the subgemmal nerve plexus showed signs of Wallerian degeneration and concomitant disappearance of taste buds. On the 3rd post-operative week, the papilla was invaded by regenerating nerves and the primordial taste buds started to appear. From the 4th week onwards, the number of regenerating taste buds on the left outer, left inner and right inner trench walls was not significantly different from the sham-operated controls. The only buds which failed to reappear were those of the upper two thirds of the right outer trench walls. The newly formed buds were smaller in size than those of the sham-operated controls with a relative diminution of 30% of the number of intragemmal cells per section of taste bu
ISSN:1422-6405
DOI:10.1159/000144811
出版商:S. Karger AG
年代:1977
数据来源: Karger
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| 12. |
Effect of the length of the distal stump of transected nerve upon the rate of degeneration of taste buds |
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Cells Tissues Organs,
Volume 98,
Issue 3,
1977,
Page 353-360
Fathy A. State,
Husseiny I. Dessouky,
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PDF (986KB)
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摘要:
The present work was carried out to study the effect of the length of the distal stump of transected nerve upon the rate of degeneration and the time course of disappearance of mammalian taste buds. Twelve adult rabbits were anaesthetized and the glossopharyngeal nerves of both sides were exposed and transected so as to leave a long distal stump on the right and a short one on the left side. The animals were sacrificed at different post-operative periods ranging from 2 to 14 days and the circumvallate and foliate papillae of both sides were examined. The taste buds on the side of the short distal stump always showed a greater decrease in number, size and cell contents than those of the side of the long distal stump. The taste buds on the side of the short distal stump disappeared earlier than those of the side of the long distal stump. Vallate taste buds disappeared earlier than the foliate: possible reasons for this were put forwards. The validity of the neurohumoral theory to the mammalian taste buds was discussed.
ISSN:1422-6405
DOI:10.1159/000144812
出版商:S. Karger AG
年代:1977
数据来源: Karger
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