276 INTUSSUSCEPTION. 



sweating, in some cases profuse; crouching; sitting on the 

 hind quarters, almost diagnostic; anxious countenance; fre- 

 quent feeble pulse; belly at first of natural size, subsequently 

 fuller, in some cases distended, dependant upon the locality 

 of the intussusception; membranes in advanced stage, turgid, 

 injected; mouth moist and clean, or furred and offensive; re- 

 spiration accelerated; continued restlessness; rearing with 

 fore-legs into manger,- and standing upon that point d'appui; 

 looking back from side to side; extremities cold; pain ab- 

 sent, tranquil; sighing or snorting; death. The sighing 

 may exist in some cases, and not in others; and in some 

 retching and vomiting." 



In the dog and pig, vomiting, constipation, and violent 

 abdominal pain, which persist or exhaust and destroy the 

 animal, are characteristic of the lesion. 



Pathological Anatomy of the Lesion. The violent con- 

 traction of the intestine at a particular spot is attended 

 with an active peristaltic movement of the portion of the 

 canal in front of the rigid constriction. Thus the con- 

 stricted portion is overlapped, and when a small portion 

 is passed over by the moving gut, the intussusception 

 increases rapidly. Mr Turner, veterinary surgeon at Mon- 

 treal, reported a case in 1849, in which no less than 

 sixteen feet four inches of the ileum had become invaginated. 

 Mr Dunsford records an instance in which eighteen inches 

 of the ileum had passed into the caecum. When the lesion 

 is observed in the large intestine, it is usually the caecum 

 that is invaginated ; in the colon the whole of this vast pouch 

 is imbedded in the latter. 



When the invagination occurs, the mesentery must be 

 partially torn, but a large fold is always carried in or covered 

 over, and the blood-vessels going to and from the invagi- 

 nated portions are thus pressed upon and obstructed. The 



