The rat submaxillary salivary gland. A correlative study by light and electron microscopy.

摘要: The rat submaxillary salivary gland has five distinct parenchymal zones. 1Acini consist of secretory and myoepithelial cells. An extensive network canaliculi connect the many cells within an acinus to main lumen. fine structure acinar suggests that they are capable great synthetic capacity; each cell having a large amount ergastoplasm, Golgi zones, material. It is proposed these continually secreting type. 2Intercalated ducts cuboidal myoepithelium. This segment connects acini conduit system gland. indicates essentially nonsecretory. 3The granular duct consists three types columnar cells; (a) dark narrow which contain free ribosomes but no ergastoplasm or granules, (b) light have varying amounts (c) full granules while other constituents including nucleus, occupy basal position. represent different stages same type. supports interpretation secretion in not continuous, cyclic nature. 4The striated forms small portion total parenchyma tall with infolding plasma membrane, relatively little very few granules. seems likely ion water metabolism specialized function this segment. 5The excretory types: cells, vesiculated infoldings arrangement capillaries around primarily concerned transport.