14 DISEASES OF THE HORSE’S FOOT 
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 corone, and 
superiorly by means of three fibrous slips on each side to 
the os suffraginis. The innermost of these three slips 
Lig lips 
eee 
i 4 {(( 
Fic. 8.—LiIGAMENTS oF THE First and SECOND INTERPHALANGEAL 
ARTICULATIONS (VIEWED FROM THE SIDE). (AFTER DoLLAaR AND 
WHEATLEY.) 
1, Outermost slip from the glenoidal fibro-cartilage ; 2, lateral ligament of 
the first interphalangeal articulation ; 3, prolongations of the lateral 
ligament of the first interphalangeal articulation attached to the end of 
the navicular bone to form the postero-lateral ligament of the pedal joint ; 
4, end of the navicular bone; 5, antero-lateral ligament of the pedal 
joint. 
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. 
