[Ultrastructure of cellular elements of the ductal system (striated ducts) in the parotid gland in white rats].
The wall of the striated ducts in the parotid gland consists of only one cell type. It is formed by high prismatic cells whose most numerous organelles are mitochondria with cristae. At the cell basis the mitochondria together with the deep infoldings of the cell membrane constitute the so-called basal labyrinth. Besides morphological manifestations of water and electrolyte transport, also signs of secretory activity were observed, processing in three basic stages: 1. accumulation of secretion, 2. exocytosis of secretion, 3. resting phase. The secretory activity was manifested both in the form of small secretory granules with differently dense content of homogenous nature and by numerous protruding blebs of the apical plasmalemma of striated duct cells. The mode of exocytosis has not been fully elucidated. Conceivably, there may be an evacuation of the content of secretory granules into the apical cytoplasm which does no longer contain formed granules. Actual secretion occurs presumably by means of the protruding blebs containing membraneous or vesicular material.
Strakele
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H
D000818:Animals; D010306:Parotid Gland / Q000648:ultrastructure*; D051381:Rats
Ultrastruktúra bunkových elementov vývodového systému (prúzkovaných vývodov) glandula parotis potkana bieleho.