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Apical cytoplasm

About: Apical cytoplasm is a research topic. Over the lifetime, 1080 publications have been published within this topic receiving 36131 citations.


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Journal ArticleDOI
TL;DR: The present results provide new morphological evidence for the vagus-nerve control of D cells, which may regulate the activity of islet cells.
Abstract: In an attempt to determine the neural control of pancreatic D cells, the pancreatic islets of the domestic fowl were examined electron microscopically from 1 to 28 days after abdominal vagotomy Exocytotic release of many secretory granules from D cells occurred one day after vagotomy Rough endoplasmic reticulum developed and formed an arrangement of concentric whorls in the cytoplasm of D cells after axotomy The altered D cells were also characterized by the occurrence of many peculiar dense bodies in the apical cytoplasm at all time periods studied These bodies varied in shape and size, containing several round vesicles The D cells were extensively depleted of granules after the longer time periods following vagotomy The present results provide new morphological evidence for the vagus-nerve control of D cells, which may regulate the activity of islet cells

9 citations

Journal ArticleDOI
TL;DR: During early gestation in the rat, at the time of rapid embryonic differentiation and prior to the full formation of the chorioallantoic placenta, the function of ‘placental’ nutrition was attributed to the yolk-sac by Brunschwig (1927).
Abstract: During early gestation in the rat, at the time of rapid embryonic differentiation and prior to the full formation of the chorioallantoic placenta, the function of ‘placental’ nutrition was attributed to the yolk-sac by Brunschwig (1927). Such a paraplacental function of the yolk-sac would assume that nutrients pass through the parietal wall into the yolk-sac cavity and thence into the embryo via the visceral yolk-sac epithelium and its underlying vitelline vessels. Supporting this concept were the findings of Everett (1935) who demonstrated in 13-day embryos that toluidine blue was able to pass into the omphalomesenteric vessels more rapidly than it could reach the umbilical veins via the chorioallantoic placenta. Furthermore, the visceral entodermal cells appeared to exert some selectivity in that trypan blue did not pass into the embryo but was localized in the apical cytoplasm. More recently, Padykula, Deren 9 Wilson (1966) demonstrated that the rat yolk-sac concentrated both vitamin B 12 and vitamin B 12 plus intrinsic factor throughout most of gestation.

9 citations

Journal ArticleDOI
TL;DR: Sparsity of basal cytoplasmic processes and mitochondria in the ureteric duct cells appears to correlate with an inability for active, energy-dependent secretory and ion transport functions.
Abstract: The epithelial cells lining the ureteric duct in the cyclostome, Myxine glutinosa, have a brush border and show specializations of their apical cytoplasm similar to those observed in absorptive proximal tubule cells in higher vertebrate species. These features and the presence of large and numerous cytosomes, presumed to contain lysosomal enzymes, indicate that the ureteric epithelium has taken over some of the functions of the proximal tubule in the “atubular” kidney of Myxine.

9 citations

Journal ArticleDOI
TL;DR: The endogenous development and pathogenicity of Eimeria neodebliecki Vetterling, 1965 are described in weaned pigs inoculated with 250 000 oocysts and Pathological changes were situated in the second half of the small intestine, with the predilection for the posterior jejunum.

9 citations

Journal ArticleDOI
TL;DR: The accessory reproductive glands of female S. gregaria are tubular extensions of the paired genital ducts, which in the mature female contain large amounts of a proteinaceous secretion used in the formation of the egg pod.

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202112
20205
20195
20188
20175
201615