138 PEINOIPLES OF VETEEINABT S0BGEKY 



WJiat symptoms do foreign todies of ihe eye and ear give 

 rise to ? 



Eye : Depending on the nature of the irritant (bits of 

 straw, hay seeds, etc.) and length of time they are present, 

 the symptoms of a chronic purulent conjunctivitis are there, 

 especially so in the horse when the foreign body is beneath 

 the membrana nictitans. 



Ear : The offending agent is usually a parasite, as lice or 

 mange parasites. 



What foreign bodies most commonly enter the hoof 9 

 Nails and glass. 



What portion of the hoof is more frequently involved ? 

 The commissures of the frog. 



What symptoms do they give rise to ? 



Lameness, the result of pain due to pododermatitis. 



Describe the actions and results of foreign bodies in the sMn 

 and in underlying parts. 

 Such foreign bodies may be bullets, shot splinters, etc. 

 The most important feature lies in the fact whether they carry 

 infection into the tissue which they enter or whether an 

 aseptic wound is produced. Bullets, unless carrying bits of 

 the harness or hair into the deeper parts, may become encap- 

 sulated, creating no further sequels. Those causing infection 

 of the parts give rise to pus production, as abscesses or more 

 or less serious cellulitis. Foreign bodies of animal origin and 

 introduced by the surgeon (catgut) become liquefied and are 

 absorbed. 



Of what su/rgical interest is air as a foreign body 9 



When animals are bled (phlebotomy), it is possible that 



