106 



THE SKELETON OF THE HORSE 



internal lateral ligament. The external surface is smaller than the internal, and 

 is marked by a wide rough fossa in which the external ligament is attached. 



The Fibular Tarsal Bone 

 The fibular tarsal bone (Os tarsi fibulare, calcaneum, os calcis) is the largest 

 bone of the hock. It is elongated, flattened from side to side, and forms a lever 



Trochlea 

 of tibial I 

 tarsal I 



Central tarsal 

 Third tarsal 



Metatarsal 

 tuberosity 

 Third yneta- 

 tarsal 



Tuber calcis 



*■- Sustentaculum 



Tuberosity 

 r i^' for lateral 

 ligament 



Fused first 

 j^i X iind second 

 ->-f V^, larsals 



Second 

 metatarsal 



Fig. 75.— Right Tarsus and Upper Part of Meta- 

 tarsus OF Horse, Internal View. (After 

 Schmaltz, Atlas d. Anat. d. Pferdes.) 



Groove for deep 

 flexor tendon 



Tibial tarsal 



Centnd 

 tarsal 



Fused first 



and second 



tarsals 



Tuber calcis 



Fibular 

 tarsal 



Fourth 

 tarsal 



Fourth 

 metatarsal 



Third 

 metatarsal 



Fig. 76. — Right Tarsus and Upper Part of Meta- 

 tarsus or Horse, Posterior (Plantar) 

 View. (After Schmaltz, Atlas d. Anat. d. 

 Pferdes.) 



for the muscles which extend the hock joint. It consists of a body and an inner 

 process, the sustentaculum tali. 



The body (Corpus calcanei) is enlarged at its proximal end to form the tuber 



Facets for fibular tarsal 



Groove of trochlea 



Depression 

 for external 

 lateral liga- 

 ment 



S\irfac( for 

 central tarsal 



biro'<ity 

 for itdirnal 

 luttral liga- 

 ment 



Fig. 77. — Right Tibial T.\rsal Bone of Horse. 

 Anterior View. (After Schmaltz, Atlas d. 

 Anat. d. Pferde.s.) 



Fossa 



Depression for 

 external lateral 

 ligament 



Fig. 78. — Right Tibial Tarsal Bone of Horse, 

 External View. (After Schmaltz, Atlas d. 

 Anat. d. Pferdes.) 



calcis or "point of the hock." The posterior part of this eminence gives attach- 

 ment to the tendon of the gastrocnemius, while in front and laterally it furnishes 

 insertion to tendons of the flexor perforatus, biceps, and semitendinosus muscles. 

 The inferior extremity l)ears a concave facet for articulation with the fourth tarsal 

 bone. The internal surface has on its lower part a strong process, the sustentacu- 

 lum tali, which projects inward. The process has a large, oval, slightly concave 



