86 



TOPOGEAPHICAL ANATOMY OF 



flexor tendon and the periosteum of the third phalanx immediately in 

 front of the semilunar ci-est. 



The structure of the torus is not uniform throughout. Towards the 



Fig. 59 — Key Outliue to Indicate the Position oi the Seetions Illustrated in Figs. 60 and 61. 



apex it is composed almost entirely of white fibrous tissue of some 

 density ; but towards the base, not only is the tissue looser, but it 



Lig. collaterale mediale. .. 



Sesamoid (navicular),-- 



A. digitalis volaris. 



M. flexor digitorum- 

 profundus. 



Digital torus. 



.M. extensor digitorum communis. 

 ^•Second phalanx. 



Cartilage of third 

 phalanx. 



^.-Wall of hoof. 



Volar branch of 

 n. volaris lateralis 



Fig. 60. — Transverse Section of the Foot at the Level Indicated by Line A in Fi^. 69. 



contains a considerable amount of fat. The presence in it of modified 

 skin-glands seems to indicate that the torus is subcutaneous tissue 

 specially thickened and structurally adapted to absorb shock. 

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