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Updated: May 31, 2025
To this stage in the process the term atheroma is applied. The endothelium over these plates often disappears, leaving them exposed to the blood-stream. Changes of a similar kind sometimes occur in the middle coat, the lime salts being deposited among the muscle fibres in concentric rings.
In advanced absolute glaucoma the chorioid may become reduced to a very thin membrane consisting of connective tissue and pigmented cells, scarcely distinguishable even by moderate powers of the microscope. Atrophy is marked in the vicinity of the venae vorticosae. Czermak and Birnbacher describe proliferation of the endothelium of the large veins with contraction and obliteration of their lumen.
It is usually of the nature of a glio-sarcoma and is highly malignant. #Endotheliomas# take origin from the endothelium of lymph vessels and blood vessels, and serous cavities.
These processes are accompanied by changes in the endothelium of the vessel walls, which result in an increased formation of lymph, which transudes into the meshes of the connective tissue giving rise to an inflammatory œdema, or, if the inflammation is on a free surface, forming an inflammatory exudate.
He cuffed it over the severed end of the artery, so cleverly that the inner linings of the vein and artery, the endothelium as it is called, were in complete contact with each other. Clutching Hand watched eagerly, as though he had found some new, scientific engine of death in the little hollow cylinder.
The cavities result either from the new formation of lymph spaces or vessels, or from the dilatation of those which already exist; their walls are composed of fibro-areolar tissue lined by endothelium and strengthened by non-striped muscle.
In other cases thrombosis is associated with certain constitutional diseases gout, for example; the endothelium of the veins undergoing changes possibly the result of irritation by abnormal constituents in the blood which favour the formation of thrombi.
Cysts are rounded sacs, the wall being composed of fibrous tissue lined by epithelium or endothelium; the contents are fluid or semi-solid, and vary in character according to the tissue in which the cyst has originated. Retention and Exudation Cysts.
Anatomy Normal and adventitious bursæ Injuries: Bursal hæmatoma DISEASES: Infective bursitis; Traumatic or trade bursitis; Bursal hydrops; Solid bursal tumour; Gonorrhœal and suppurative forms of bursitis; Tuberculous and syphilitic disease Tumours Diseases of individual bursæ in the upper and lower extremities. A bursa is a closed sac lined by endothelium and containing synovia.
Gaps occur in the elastic membrane which become covered by endothelium. Some cloudiness may be seen in the corneal lamellae adjacent to these fissures, in some cases due evidently to the filtration of aqueous humor through defective endothelium. Prolonged high intra-ocular tension may be accompanied, particularly in cases of secondary glaucoma, by vesicular and bullous keratitis.
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