title: Structure of the myenteric plexus in the sphincters of cat gastro-intestinal tract. I. Quantitative assessment of the types of dense-core vesicles.
abstract: Ultrastructural studies show that dense-core vesicles are among the most frequently occurring types of vesicles in the axonal varicosities of the myenteric plexus of the gastro-intestinal tract, and interest in them is due to their significance for the formation, storage and release of the transmitters. However, measurements so far have been made on the basis of the images of the dense-core vesicles on the electronograms, whereby the size and the type of the vesicles greatly depend on their position with respect to the surface of the sections observed. The methods applied by us made it possible to determine the spatial dimensions and the density of the dense-core vesicles in the myenteric plexus of the sphincters of cat gastrointestinal tract. Using the method of reconstruction in arranging the diameters in geometrical order, five populations of dense-core vesicles with corresponding mean diameter and small mean square deviation are differentiated.
mesh_terms: D000818:Animals; D002415:Cats; D004943:Esophagogastric Junction / Q000294:innervation / Q000648:ultrastructure; D066298:In Vitro Techniques; D009197:Myenteric Plexus / Q000648:ultrastructure*