FREE BOOKS

Author's List




PREV.   NEXT  
|<   190   191   192   193   194   195   196   197   198   199   200   201   202   203   204   205   206   207   208   209   210   211   212   213   214  
215   216   217   218   219   220   221   222   223   224   225   226   227   228   229   230   231   232   233   234   235   236   237   238   239   >>   >|  
the pain, but by giving to rest the time he should normally give to feeding. Difficulty in rising is greatest when all four feet are affected; is _nearly_ as great when the hind-limbs only are in trouble, but is least when the disease exists alone in the two fore-feet. THE COURSE OF THE DISEASE AND ITS PATHOLOGICAL ANATOMY.--As with most inflammations of any severity, so with this we may consider the pathological changes taking place in the foot under three headings: (a) The period of Congestion; (b) the period of Exudation; (c) the period of Suppuration. (a) _Congestion_.--In the early stages of laminitis there is a state of engorgement of the vessels of the keratogenous apparatus generally, but more particularly the laminal portion of it. With the hoof removed at this stage the sensitive laminae are found to be swollen, dark red in colour, and affording a distinct feeling of increased thickness when pressed between the fingers, Incised, there escapes from the cut surface a large flow of dark venous-looking blood. At this stage haemorrhages of the laminal vessels occur. The escaping blood infiltrates the surrounding connective tissue, and in many cases destroys the union between the horny and sensitive laminae. This change is most noticeable in the region of the toe and the commencement of the quarters, the os pedis appearing as though pushed backwards by the escaping fluid collected between the wall and the bone. In severe cases, fortunately but rarely seen, the blood so escaping continues to infiltrate, and separate the tissues until it is seen to be freely oozing at the region of the coronet. (See reported case, No. 1, p. 279.) (b) _Exudation_.--The period of exudation marks the outpouring of the inflammatory fluid. This, even more than the haemorrhages attending the stage of congestion, tends to destroy the intimacy between the sensitive and the horny laminae, leading finally to their complete separation at the region of the toe. Fig. 116 illustrates this state of affairs after laminitis has existed for a week. The sensitive and horny laminae are here shown to be distinctly separated from each other, a well-marked cavity existing between them, which cavity is greatest in extent at the toe of the os pedis. With the sensitive structures thus detached from the wall, it is evident that very much that formerly held the os pedis in normal position has been destroyed. What then happens is that the whole of the body-
PREV.   NEXT  
|<   190   191   192   193   194   195   196   197   198   199   200   201   202   203   204   205   206   207   208   209   210   211   212   213   214  
215   216   217   218   219   220   221   222   223   224   225   226   227   228   229   230   231   232   233   234   235   236   237   238   239   >>   >|  



Top keywords:

sensitive

 
period
 

laminae

 
escaping
 
region
 

Congestion

 

laminitis

 

vessels

 
laminal
 
Exudation

haemorrhages
 

cavity

 

greatest

 

pushed

 

backwards

 

commencement

 

quarters

 

appearing

 
infiltrate
 
continues

fortunately

 

severe

 

separate

 

tissues

 

collected

 

reported

 
coronet
 
oozing
 

freely

 
rarely

separated

 
marked
 

distinctly

 
existed
 
existing
 

position

 
normal
 

evident

 

detached

 
extent

structures

 

congestion

 

noticeable

 

attending

 

outpouring

 

inflammatory

 
destroy
 

intimacy

 

illustrates

 

destroyed