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 



tarsal 



Central tarsal 

 Third tarsal 



Metatarsal 

 tuberosity 

 Third meta- 

 tarsal 



Tuber calcis 



Sustentacidum 



Tuberosity 

 for lateral 

 ligament 



Fused first 

 and second 

 tarsals 



Second 

 metatarsal 



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

 tarsus OP Horse, Internal View. (After 

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



Groove for deep 

 flexor tendon 



Tibial tarsal 



Centra] 

 tarsal 



Fused first 



and second 



tarsals 



Tuber calcis 



Fibidar 

 tarsal 



Fourth 

 tarsal 



Fourth 

 metatarsal 



Third 

 metatarsal 



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

 T.vRSus OF 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 



Surface for 

 central tarsal 



Tuberosity 

 for internal 

 lateral liga- 

 ment 



Fig. 77. — Rkjht TiniAi, Tarsal Bone of Horse. 

 Anterior View, (.\fter Schmaltz, Atlas d. 

 Anat. d. Pferdes.) 



Fossa 



Depression for 

 external lateral 

 ligamc7it 



Fig. 78. — Right Tiiual 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, bicejis, and semitendinosus muscles. 

 The inferior extremity l)(\ars a concave facet for articulation with the fourth tarsal 

 bone. Th(^ 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 



