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Diseases of the Horse's Foot by Harry Caulton Reeks
page 31 of 513 (06%)
interosseous ligaments of the articulation.

_The Posterior Border_, thick in the middle, but thinner towards the
extremities, is roughened for ligamentous attachment.

_Development_.--The bone ossifies from a single centre.


B. THE LIGAMENTS.

THE ARTICULATION OF THE FIRST WITH THE SECOND PHALANX, OR THE PASTERN
JOINT.--Adhering to the limit we have set, this articulation should not
receive our attention. As, however, we shall in a later page be concerned
with fractures of the os coronæ, which fractures may affect the
articulation above mentioned, a brief note of its formation will not be out
of place.

It is an imperfect hinge-joint, permitting of extension and flexion,
allowing the first phalanx to pivot on the second, and admitting of the
performance of slight lateral movements. It is formed by the opposing of
the inferior surface of the os suffraginis with the superior surface of the
os coronæ. The articulating surface of the os coronæ is supplemented by
the addition behind of a thick piece of _fibro-cartilage (the glenoid_)
attached inferiorly to the posterior edge of the upper articulatory surface
of the os coronæ, and superiorly by means of three fibrous slips on each
side to the os suffraginis. The innermost of these three slips becomes
attached to about the middle of the lateral edge of the suffraginis, and
the remaining two, beneath the first, attach themselves to nearer the lower
end of that bone. The posterior surface of the complementary cartilage
forms a gliding surface for the passage of the perforans.
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