INFLAMMATION. 59 



ease, which may be internal. Nervous symptoms may be present, 

 as pains of various sorts, according to the location. Vascular symp- 

 toms, changes in the pulse, etc. Respiratory symptoms, as those 

 already alluded to. Digestive changes may be prominent, some 

 alterations in the secretions and excretions, or some interference 

 with the nutritive processes. 



What are the forms of inflammation as regards their 

 situation ? 



They are superficial when the outer parts of an organ are in- 

 volved, and deep when the deeper portions are the seat. 



The deeper inflammations may be parenchymatous when the 

 tissue proper is involved, and interstitial when the connective tissue 

 is involved. 



What is an exudation ? 



It is derived from ex, meaning " out," and sudo, signifying "I 

 sweat." It is an accumulation of lymph, or serum, or plasma, or 

 fibrin, or corpuscles (red or white), or a combination of any two or 

 all of the above named. 



Name the varieties of exudation. 



Serous or fibrino-serous, fibrinous, purulent or fibrino-purulent, 

 catarrhal, croupous, diphtheritic, hemorrhagic. 



Describe serous or fibrino-serous exudation. 



The exudations of inflammations of serous membranes consist 

 of serum, fibrin, or pus, in variable proportions. The first change 

 causing a serous exudation is an increased amount of blood in the 

 blood-vessels of a part ; then a coagulation of fibrin elements. 



If the inflammation occurs in the pleura or peritoneum, serum 

 is mostly always present, and, if in great amount, it is called a serous 

 exudation. If part be serum and part fibrin, it is called a, fibrino- 

 serous exudation. 



What are a fibro-purulent and a purulent exudation ? 



When leucocytes are present in large numbers, the exudation 

 is termed fibrino-purulent. The greater the intensity of the inflam- 

 mation and the more enfeebled the patient, the more likely is pus 

 to form. When there is a quantity of pus present it becomes & puru- 

 lent exudation. If blood be present from a rupture of capillary 

 vessels, the exudation is termed a hemorrhagic exudation. 



