Ultrastructure du parenchyme sécréteur de la glande postanale du cælacanthe,Latimeria chalumnaeSmith
作者:
Michel Lemire,
Michael Lagios,
期刊:
Cells Tissues Organs
(Karger Available online 1979)
卷期:
Volume 104,
issue 1
页码: 1-15
ISSN:1422-6405
年代: 1979
DOI:10.1159/000145050
出版商: S. Karger AG
关键词: Electron microscopy;Coelacanth;Postanal‘salt-secreting’ gland;Osmoregulation
数据来源: Karger
摘要:
Latimeria chalumnae Smith, the only surviving crossopterygian, possesses a well-developed, unpaired, postanal gland whose function is as yet undocumented. The availability of tissues suitable for ultrastructural and histochemical studies from the recent International Comores Expedition has permitted a reappraisal of the comparative morphology and functional hypotheses relating to the postanal gland. The richly vascularized tubuloacinar postanal gland is composed of cells which show the characteristic specializations of active ion transport. These include complex and extensive development of basal and lateral cell membrane infolding (cisternae) which are closely associated with numerous large, dense mitochondria. Histochemical studies have shown a high level of ATPase activity within the gland cells. These features of the postanal gland correlate well with those of the rectal glands of elasmobranchs and suggest a similar role in ion excretion and osmoregulation.
点击下载:
PDF
(2175KB)
返 回