BACTERIOLOGY IN A NUTSHELL. 



The Peyerian 

 Glands. 



Changes 

 Produced. 



Hemorrhage. 



Perforation 



and 



Peritonitis. 



Absorption 

 of Poison, 



what is known as the iliem, situated near the 

 ileo-caecal valve. The bacillus first attacks cer- 

 tain structures termed the Peyerian glands 

 (also termed "Peyer's patches," after the an- 

 atomist who first discovered or described 

 them). These glands are small white look- 

 ing patches, or groups of lymph follicles, (tinj 

 sacs containing great numbers of small, 

 round cells and some fluid) in the mucous and 

 submucous layers of the lower part of the small 

 and the beginning of the large intestine. As a 

 result of the attack, the Peyerian glands in- 

 flame, swell, thicken and frequently ulcerate 

 When ulceration occurs sloughing or casting 

 off of dead particles of tissue follows and an 

 open sore is left behind. Sometimes a blood 

 vessel is punctured by an ulcer, when a hem- 

 orrhage more or less severe in its effect takes 

 place. An ulcer may, and frequently does, 

 extend through the entire wall of the intestine^ 

 when perforation and the escape of the in- 

 testinal contents into the abdominal cavity 

 causes peritonitis and death, unless the perfora- 

 tion is such as can be repaired and the patieni 

 is in a condition to warrant such a measure. 



While the small intestine is said to be the 

 chief seat of the bacterial invasion, the various 

 systems of the human structure are also 

 affected. There is elevation of temperature, 

 due to absorption of poison produced by the 

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