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-
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