THE SENSORY APPARATUSES. 



tective layer enveloping the digital extremities, and constituting the claws of 

 Garni v'ora, the Pig, Ox, Sheep, and Goat, and the hoofs of the Horse, Ass, and 

 Mule. These latter productions, ranking as they do among the most important 

 organs of the locomotory apparatus of Solipeds, will fii-st receive notice. 



1. The Hoof of Solipeds. 



The hoof of Solipeds is an extremely important study, because of the 

 numerous diseases which affect this region. Consequently, it has been the 

 subject of several voluminous works, to which the student must be referred 



for a more complete description of 



Fig. 490. 



LONGITUDINAL MEDIAN SECTION OF THE FOOT. 



1, Anterior extensor of the phalanges, or extensor 

 pedis; 2, literal extensor, or extensor suffraginis; 



3, capsule of metacarpo-phalangeal articulation ; 



4, large metacarpal bone ; 5, superficial flexor of 

 the phalanges, or perforatus ; 6, deep flexor, or 

 perforans ; 7, sheath ; 8, bursa ; 9, sesamoid 

 bone; 10, ergot and fatty cushion of fetlock; 11, 

 crucial ligament; 12, short sesamoid ligament; 

 13, first phalanx; 14, bursa; 15, second pha- 

 lanx ; 16, navicular bone ; 17, plantar cushion ; 

 18, third phalanx; 19, plantar surface of hoof; 

 20, sensitive or keratogenous membrane of tliird 

 phalanx. 



its organization ; ^ as we cannot do 

 more here than give some essentially 

 descriptive details, necessary to fill 

 up the outline that we have traced 

 out. 



We will at firet glance at the parts 

 contained in the hoof, returning after- 

 wards to a description of the homy 

 case itself. 



a. The Pabts contained in the 

 Hoof. 



Proceeding from within to with- 

 out, we find, in the interior of the 

 horny box : 1. The third phalanx, 

 navicular bone, and lower part of 

 the second phalanx, forming the 

 articulation of the foot. 2. The four 

 ligaments that bind this articulation. 

 3. The tendon of the common ex- 

 tensor of the phalanges which covers 

 the articulation in front, and that of 

 the perforans which supports it be- 

 hind, in becoming inserted into ' the 

 pedal bone, after gliding over the 

 posterior surface of the navicular 

 bone. 4. The complementary ap- 

 paratus of the third phalanx. 5. 



The matrix of the hoof, or kerato- 

 genous membrane— a continuation of the derma covering the digital region. To 

 these parts must be added the vessels and nerves of thi» region. 



The description of the bones has been given at pp. 114, 150 ; 



Of the articulation and its ligaments, at p. 209 ; 



Of the tendon of the anterior extensor of the phalanges, at p. 325 ; 



Of the perforans tendon, at p. 331 ; 



* Pee particularly, among the French works, the Traite de VOrgnnisation du Pied du 

 Cheval, by M. H. Bouley. (See nlso the still more recent work by Leis<ring, Der Futz det 

 Pferdeg Dresden : 1870. Also a long series of papers by me on this subject in the Veteri- 

 narian for 1871-2.^ 



