The content of mast cells in the pleural membranes, pericardium and liver capsule of cattle and horse; a comparison with earlier observations and assays of heparin and of histamine in these tissues. The number of mast cells per area and volume have been counted in the pleura, pericardium and capsula hepatis of cattle and horse.
The capsula hepatis of cattle contains a 5—10 times larger number of mast cells than the other tissues. The pleura pulmonalis showed a content of mast cells which was only a fraction of that in the liver capsule. The high histamine content found by Riley and coworkers when analyzing ox pleura seem to indicate that histamine is liberated not only from the mast cells, but also from other elements of the tissues.
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