82 



TOPOGRAPHICAL ANATOMY OF 



The inner surface of the wall is laminated in conformity with the 

 lamination of that part of the matrix to which it is applied. In the 

 natural state the laminae (cristae ungulae) of the hoof occupy the 

 intervals between the lamina? of the matrix. Though to the naked 

 eye the laminae appear simple, under magnification each surface of 

 every lamina is found to carry secondary laminas which interdigitate 

 with corresponding secondary ridges of the laminar matrix. 



The coronary border (margo occultus) of the wall gradually thins 

 away, because of the presence of a groove into which the coronary 



Coronary border of 

 the wall. 



Coronary groove. 



Limbus ungulse 



(periople). 



Laminae of wall. 



Limbus ungulse. _ _^ 



L^yer of pale 

 horn ('' white 

 line"). 



Spine of the cuneus. 



Fig. 56. — Inner Surface of tlie Hoof. 



matrix is received. The groove is closely punctated with small holes 

 into which the papillae of the matrix are received. 



The free border (margo liber) in the unshod animal comes into 

 contact with the ground, and has a more or less ragged appearance due 

 to destruction of the hoof by friction and attrition. The thickness of 

 the border is greatest at the "toe" (about 10 mm.), and gradually 

 becomes less towards the "heel," where it is barely half that of the 

 " toe." The free border is connected with the margin of the sole of 

 the hoof by a definite line of pale and relatively soft horn. 



The inflected part (pars inflecta, "bar") of the wall forms a 

 gradually tapering ridge on the volar aspect of the digit, between the 

 sole and the cuneus (" frog "). 



2. The sole (solea ungulae) is a strong plate of horny tissue applied 

 to the solar (volar) matrix, and indented by a deep triangular notch 

 into which are fitted the inflected parts of the wall and the "frog." 

 Speaking generally, therefore, the sole may be said to have a crescentic 



