Seasonal Ultrastructural Changes of the Hypophyseal Pars tuberalis in the Hedgehog (Erinaceus europaeusL.)
作者:
A. Rüttern,
M. Hewing,
W. Wittkowski,
期刊:
Cells Tissues Organs
(Karger Available online 1988)
卷期:
Volume 133,
issue 3
页码: 217-223
ISSN:1422-6405
年代: 1988
DOI:10.1159/000146643
出版商: S. Karger AG
关键词: Adenohypophysis;Pars tuberalis;Ultrastructure;Seasonal changes;Hedgehog
数据来源: Karger
摘要:
The comparison of the hypophyseal pars tuberalis in active and in hibernating hedgehogs reveals different cytological characteristics in the specific secretory cells. In active animals, these cells show oval nuclei and the cytoplasm contains numerous secretory granules near or attached to the cell membrane, suggesting exocytotic release. In hibernating animals, the specific secretory cells are characterized by irregularly shaped and often invaginated nuclei. Clusters of secretory granules lying within the cytoplasm are often joined by lysosomes. These areas are observed to be encircled by cisterns of the endoplasmic reticulum. Degenerative processes in the structures sequestered in this way are interpreted as signs of crinophagy which has no equivalent in the cell types of the pars distalis.
点击下载:
PDF
(1470KB)
返 回