title: NEW CYTOPLASMIC COMPONENTS IN ARTERIAL ENDOTHELIA.
abstract: A hitherto unknown rod-shaped cytoplasmic component which consists of a bundle of fine tubules, enveloped by a tightly fitted membrane, was regularly found in endothelial cells of small arteries in various organs in rat and man. It is about 0.1 micro thick, measures up to 3 micro in length, and contains several small tubules, approximately 150 A thick, embedded in a dense matrix, and disposed parallel to the long axis of the rod. In some of these cells, the cisternae of the endoplasmic reticulum are greatly distended by the accumulation of a dense, finely granular material. The nature and significance of these cytoplasmic components are yet unknown.
mesh_terms: D000818:Animals; D001158:Arteries; D002319:Cardiovascular System; D003585:Cell Biology; D003593:Cytoplasm; D003594:Cytoplasmic Granules; D004721:Endoplasmic Reticulum; D004730:Endothelium, Vascular; D006651:Histocytochemistry; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D051381:Rats; D012106:Research
keywords: ARTERIES; CYTOLOGY; CYTOPLASM; ENDOPLASMIC RETICULUM; EXPERIMENTAL LAB STUDY; HISTOCYTOCHEMISTRY; RATS