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 Hexor 

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



M. interosseiis. 



M. flexor cligitovuni - 

 sublimis. 



Sesamoid bone. 



JI, flexor digitoruiu _ 

 profundus. 



"Ergot. 



Third metacarpal l)Oiie. 



-SI. extensor digitorum coniniuiiis. 



Ligg. sesanioidea obliMua 

 Lig. sesamoideum rectum. _ 



il. flexor digitorum piofuiidus 



Sesamoid. 



5 



Lig. phalangosesamoideum 



— Second phalanx. 



_. Third phalanx. 



Wall of hoof. 



Laminar matrix. 



~ Terminal arch of 

 digital vessels. 



Ciineus (" frog") 



Cuiieate matrix. 



Digital torus. 



Solar matrix. 



Fig. 58. — Longitudinal Section of the Digit. 



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

 interphalaiigeal, 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 



