86 



TOPOGKAPHICAL ANATOMY OF 



flexor tendon and the periosteum of the third phalanx immediately in 

 front of the semilunar crest. 



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



Fig. 59 — Key Outline to Indicate the Position of the Sections 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 mediate. 



Sesamoid (navicular).- - 



A. digitalis volaris. — - 



M. flexor digitorum-' 



profundus. 



Digital torus. - 



M. extensor digitoruni communis. 

 „ -Second phalanx. 



Cartilage of third 

 phalanx. 



Wall of hoof. 



Volar branch of 

 n. volaris lateral] 



Fig. 60. — Transverse Section of the Foot at the Level Indicated by Line A in Fis;. 59. 



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. 



