908 



THE SENSORY APPARATUSES. 



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

 Carnivora, the Pig, Ox, Sheep, and Goat, and the hoofs of the Hoi-se, Ass, and 

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

 oro-ans of the locomotory apparatus of Solipeds, will first 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 

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



for a more complete description of 

 F'g- 490. its organization ; ^ as we cannot do 



more here than give some essentially 

 descriptive details, necessary to till 

 up the outline that we have traced 

 out. 



We will at first glance at the parts 

 contained in the hoof, returning after- 

 wards to a description of the horny 

 case itself. 



a. The Pabts contained in the 

 Hoof. 



■ Proceeding from within to with- 

 out, we find, in the interior of ths 

 horny box : 1. The third phalanx, 

 navicular bone, and lower part of 

 the second phrJanx, 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. b. 



LONGITUDINAL MEDIAN SECTION OF THE FOOT. 



1, Anterior extensor of tlie phalanges, or extensor 

 pedis; 2, literal extensor, or extensor suffraginis ; 



3, capsule of metacarpo-phalangeal articulation ; 



4, large metacarpal bone ; .5, superficial Hcxor of 

 the phalanges, or perforatu'^ ; 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 kerutogenous membrane of third 

 phalanx. 



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 this 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 V Orgnnhatinn dzi Pied dn 

 Cheral, by M. H. Bouley. (See also the still more recent work by lieisiriiig, Der Futz de* 

 P/erdes Dresden : 1870. Also a long series of papers by uie on this subject in the Vfteri- 

 narian for 1871-2.> 



