FORE FOOL' OF THE OX. 
133 
again by horn, forms that part commonly called the dew claw. 
It is connected to its horny covering by very numerous laminse. 
This appendage affords considerable protection to the fetlock 
joint, and, probably, is useful occasionally in preventing the 
animal from slipping. From each dew claw a strong ligament 
proceeds to the cartilago-ligamentous heels. 
Tendons. — The jlexor perforatus at the head of the large me- 
tacarpal bone is divisible into two portions, which become united 
about two-thirds down the bone. Just above the fetlock joint 
it again bifurcates, becomes flat, and, being joined by a branch 
of the suspensory ligament, forms two separate sheaths for the 
two divisions of the tendo perforans. Each portion is then con- 
tinued down the back part of the suffraginal bones, and is in- 
serted into the postero* superior part of the small pastern. 
The jlexor perforans accompanies the perforatus within their 
common sheath. It is single just below the knee, but splits 
into two portions at the situation of the union of the perforatus. 
Just above the fetlock, each portion enters the sheath formed by 
the perforatus, and here increases in size, and becomes firmer 
in substance. It is smaller and softer at the back of the pas- 
terns ; and just before it arrives at the os pedis, it becomes 
closely connected with the cartilago-ligamentous heels. It is 
continued behind the navicular bone, where it becomes as wide 
as the bone itself, increasing in size until its insertion in the 
infero-posterior part of the os pedis. 
The right extensor corona is situated in front of the meta- 
carpus on the right side of the other tendons. It takes a course 
to the right os suffraginis, at the upper part of which it becomes 
more extenuated and broad. Continuing to expand, it has an 
extensive attachment to the large pastern, and about half way 
down the bone it splits into two portions. The larger of these 
continues in a straight direction to the pastern joint, where, 
being lined by synovial membrane, it forms the anterior division 
of the capsule of the joint, and is inserted immediately below it 
into the supero-anterior part of the os coronae. The smaller por- 
tion takes a course obliquely to the right, passes over the cap- 
sular ligament, is joined by the external slip of the suspensory, 
expands considerably, and is inserted into the cartilago-ligamen- 
tous heels. 
The lej't extensor corona is situated on the left side of the 
extensor pedis ; and its connexions, course, and terminations, 
are similar to the last tendon. 
The extensor pedis is rather smaller than the two preceding 
tendons, between which it takes its course. Just above the 
fetlock it splits into two portions, each of which plays within a 
