Abstract：
:Changes in the fine structural organization of the pars intermedia related to the onset of secretory activity within the gland have been studied. It is shown that during the first seven days, following the onset of secretory activity, there is an extensive membraneogenesis within the cytoplasm of the parenchymatous cells of the pars intermedia which results in the formation of a well-organized array of endoplasmic reticulum and an increased development of the Golgi complex. Simultaneously the large population of secretory granules present in the cells in the inactive condition is reduced, the granules fusing with the plasma membrane and releasing their contents into the extracellular space. During the process of intracellular reorganization, in addition to the elaboration of those components of the Golgi complex which are believed to be concerned with the formation of the secretory granules, a second distinctive cisternal element develops within the Golgi area. This component which remains confined to the Golgi area for only a short time (days 2-4) appears to be responsible for the production of membrane-bound dense bodies with a finely granular content. The dense bodies, in turn, become transformed into the larger heterogeneous structures which are a prominent feature of actively secreting pars intermedia cells.
journal_name
Tissue Celljournal_title
Tissue & cellauthors
Hopkins CRdoi
10.1016/s0040-8166(70)80007-6subject
Has Abstractpub_date
1970-01-01 00:00:00pages
59-70issue
1eissn
0040-8166issn
1532-3072pii
S0040-8166(70)80007-6journal_volume
2pub_type
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