Morphological aspects of asynchronous secretion of pancreatic cells

An electron-microscopic study of the pancreas of several vertebrates showed that asynchronous secretion of the pancreatic cells is controlled by means of cytoplasmic cell appendages that determine the selective access of primary materials to the gland cells. The outflow of hormones and other metabolites from the intercellular spaces into the pericapillary space is also controlled in the pancreas by means of cytoplasmic appendages.