THE LIMBS OF THE HOESE 85 



third phalanx. Its deep (dorsal) surface slopes from above downwards 

 and forwards in conformity with the obliquity of the deep flexor 

 tendon close to its insertion. Between the torus and the tendon 



M. interosseiis. -f 



M. flexor digitoruni 

 sublimis. 



Sesamoid bone. 



>1 flexor digitonun 

 profundus. 



"El-got, 



-^Thivd metacarpal bone. 



M. extensor digitorum communis. 



Ligg. sesamoidea oblifjua, ' 



Lig. sesanioideum rectum 



2. 



iJ. flexor digitorum profundus 



Sesamoid. 



5 



Lig". phalaugosesamoideum 



Second phalanx. 

 3'. 



__ Third phalanx. 



Wall of hoof. 



"^'iX Laminar matrix. 



Cuneus ("frog"). 



Cuneate matrix 



~ Terminal arch of 

 digital vessels. 



Sole. 



Digital torus. 



Solar matrix. 



Fig. 58. — Longitudinal Section of the Digit. 



1 and 1', 2 and 2', 3 and 3'. = Joint capsules of the metacarpo-phalangeal, proximal 

 interphalangeal, and distal interphalangeal articulations respectively. 4. = Synovial sheath 

 of the flexor tendons. 5. = Synovial sheath of the deep flexor tendon. 



there is a fascial sheet that is proximally connected with the first 



phalanx. 



The more superficial (volar) surface of the torus is almost horizontal 



when the weight of the body rests on the limb. It is covered by the 



cuneate part of the matrix, and upon this surface the cuneus (" frog ") 



is moulded. Two diverging ridges bound a cleft into which the spine 



of the " frog " fits. The ridges blend in front, and behind they end in 



two rounded eminences that constitute the base or bulbs of the torus. 



The apex of the torus is firmly adherent to the insertion of the deep 

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