Cuboidal Endothelial Cells Research Articles

Ultrastructural and histochemical investigation of the terminal capillaries in the spleen of the carp (Cyprinus carpio L.)

In the spleen of the carp arterial capillaries of a highly differentiated structure have been studied by light and electron microscopy. These capillaries share various structural characteristics with the sheathed capillaries (ellipsoids of Schweigger-Seidel) of higher vertebrates. The long arterial capillaries of the carp spleen are provided with cuboidal endothelial cells containing filaments approximately 7 nm in diameter. There is no basal lamina. The endothelial cells form various types of cell junctions, but there are also extensive areas without any junctions. Here, a free passage is possible between the capillary lumen and the subendothelial space. The capillaries possess a single-layered sheath of macrophages. Characteristically, the sheath macrophages posses long and slender cell processes forming a loose framework, the meshes of which are filled with lymphocytes and spindle cells. The sheath macrophages show a zone of ectoplasm rich in filaments. The also contain numerous phagolysosomes rich in hydrolytic enzymes, as identified histochemically. The sheath is sharply limited against the pulp by a thick layer of collagen fibers.

Epidural Hemorrhage Secondary to Cavernous Hemangioma of the Petrous Portion of the Temporal Bone

Hemangiomas of the bone are rare. They constitute from 1 to ~ per cent of all bone tumors. The most common site of hemangiomas is in the vertebrae, those of the skull being second in frequency. In the skull they are usually found in the calvarium, involving the parietal and frontal lobes, m There are two types of hemangiomas. The capillary variety is made up of closely packed capillaries which are lined by a single layer of nearly cuboidal endothelial cells. The more common cavernous type is composed of larger blood-filled spaces which are lined by a single layer of flattened endothelial cells. Elastic fibers and smooth muscle are usually not present in the walls of these tumors and the amount and character of the fibrous supporting stroma vary greatly? CASE REPORT