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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.
Thrombosis of the deep veins in the leg, for example may induce marked dilatation of the superficial veins, by throwing an increased amount of work upon them. This is to be looked upon rather as a compensatory hypertrophy of the superficial vessels than as a true varix. Morbid Anatomy.
Occasionally if shock is decided to be due to a toxemia, the toxin may be diluted by the withdrawal of a small amount of blood and the transfusion of an equal amount of saline solution. This condition is not well understood, nor is its frequence known, but not a few instances of shock are due to dilatation of this organ. The shock to the heart may be a reflex one through the pneumogastric nerves.
And yet, somehow, this attitude only served to enhance her essential femininity. Nevertheless, Cleggett was inflexible. "You would scarcely forbid me to go to Morris's today, or anywhere else I may choose," she said hotly, with a spot of red on either cheek bone, and a dangerous dilatation of her eyes.
Dilatation and tortuosity of the anterior ciliary veins are due apparently to excessive flow of blood through them on account of the abnormally small amount carried off by the venae vorticosae. In the stage of degeneration, ectasae of the sclera occur most frequently near the equator of the globe. Spontaneous rupture may take place. Anterior Chamber. The anterior chamber is shallow, as a rule.
Then he remembered the grand line of the African freedman, that makes all human interests everybody's business, and had a sudden sense of dilatation and evolution, as it were, in all his dimensions, as if he were a head taller, and a foot bigger round the chest, and took in an extra gallon of air at every breath, Then you who have written a book that holds your heart-leaves between its pages will understand the movement he took down "Thoughts on the Universe" for a refreshing draught from his own wellspring.
Aneurysm near the origin has to be diagnosed from subclavian, innominate, and aortic aneurysm, and from other swellings solid or fluid met with in the neck. It is often difficult to determine with precision the trunk from which an aneurysm at the root of the neck originates, and not infrequently more than one vessel shares in the dilatation.
The specific germ of the disease, or the toxin elaborated by this germ, may be especially depressant to the heart, as in diphtheria, or the germ may be particularly prone to locate in the heart, as in rheumatism and pneumonia. But all feverish processes, sooner or later, if sufficiently prolonged, cause serious cardiac weakness and more or less dilatation.
There is an undue pressure upon all between-vessel structures, a pressure that must lessen the nutrient supply more or less, according to its degree. The death of parts in boils and abscesses is due, I believe, to strangulation of the nerve-supply. The bloodvessels are elastic, and capable of contraction and dilatation, a matter regulated by the brain.
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