THE FOURTH CARPAL BONE 



97 



and a lateral one for the fourth or lateral metacarpal bone. The medial surface 

 has two or three facets for articulation with the third carpal, between which it i:^ 

 excavated and rough. The dorsal surface is convex and rough. The lateral sur- 



Mdl 



McIII 



Fig. 73. — Left Cahpus or Horse, with Parts or Adjacent Bones; Volar View. 

 The accessory and first carpal bones have been moved out of their natural position and their articular connections 

 indicated by arrows. CV, Radial carpal; 3, intermediate carpal; Cu. ulnar carpal; CVj, accessory carpal; CI, first 

 carpal- C2 second carpal; 4, third carpal; Ci, fourth carpal; 1, groove for lateral extensor tendon; 2, tuberosity 

 of radius for medial ligament of carpal joint; 5, volar tubercle of fourth carpal; 6, rough area on large metacarpal 

 bone for attachment of suspensory ligament. 



Inlermediale 



J' 



Ulnar 



Third 



Radiid 



Fig. 74. — Pkoximal Row of Left Carpus of Horse; 



Proximal View. 



1-4, Articular facets corresponding with those on Fig. 69; 



5, groove for tendon of ulnaris lateralis. 



Fuurth 



Second 



First 



Fig. 75. — Distal Row of Left Carpus of Horse: 

 Proximal \'iew. 

 1, Articulation of first carpal with second; 2, 2 , 

 facets for radial; 3, 3', facets for intermediate; i, 

 facet for ulnar. 



