1 72 
DISEASES OF THE FOOT. 
of the wall and sole of the coronet and frog. Inflammation attacks the 
connective tissue lying below the coronary band, producing a subcoronary 
inflammation, which usually 
involves one-half of the hoof, 
occasionally the whole, and is 
recognised by the severe swell¬ 
ing and intense pain around 
the coronet. As pus may 
burrow into the pedal-joint, 
the condition is grave. When 
occurring about the back of 
the coronet, this form of in¬ 
flammation generally leads to 
sinuses or quittors, which, how¬ 
ever, are still more often the 
result of suppuration in the 
posterior sections of the sensi¬ 
tive sole or wall, where the sub¬ 
cutis is in direct contact with 
the parachondral connective 
tissue. 
Parenchymatous pododerma- 
titis in the sensitive frog often 
causes purulent cellulitis of the 
fibro-fatty frog, which is parti¬ 
cularly dangerous, on account 
of so often extending to the 
flexor pedis perforans tendon 
and producing necrosis. Puru¬ 
lent cellulitis of the fibro-fatty 
frog is distinguished by the 
violent pain shown, especially 
on dorsal flexion of the pha¬ 
langes. When weight is placed 
on the affected limb the parts 
are kept in a condition of exces¬ 
sive volar flexion; weight can 
only be borne for a moment, 
and the animal puts down the 
foot with the front of the wall 
Fig. 290. —To illustrate the joints and deep-seated 
arteries, veins and nerves involved in surgical 
injuries of the foot. Right fore foot, seen from 
below, behind, and somewhat from one side. 
The outer lateral cartilage is removed, together 
with sufficient of the pedal hone to render visible 
the vessels, &c., in its interior. The nerves 
accompanying arteries /", are shown too thick ; 
they should be less than half as broad as figured. 
a, Digital artery ; b , posterior suffraginal artery ; 
c, artery of plantar cushion (cut through) ; d, 
posterior artery of coronary circle ; /, plantar 
artery, which anastomoses with its fellow within 
the pedal bone, and gives off twigs f, which 
pass to the anterior surface of the pedal bone, 
just above its lower edge ; g, twigs of plantar 
artery supplying coffin joint; E, deep lateral 
layer of coronary plexus, clothing inner surface 
of lateral cartilage ; F, divided ends of super¬ 
ficial part of coronary plexus. From these arise 
the digital vein (not shown) ; IT, plantar vein ; 
4, posterior branch of digital nerve accompany¬ 
ing vessels into pedal bone ; 5, twigs of posterior 
branch passing towards sensitive laminae. 
quite upright, or directed downwards and backwards. Swelling appears 
in the hollow of the heel; after some time abscesses form and break, and 
not infrequently the flexor pedis perforans becomes ruptured. 
