342 



FASCIA AND MUSCLES OF THE HORSE 



tarsal bone. The tarsal sheath (Vagina tarsea) begins two to three inches (ca. 

 5 to 7.5 cm.) above the level of the medial malleolus, and extends about one-fourth 

 of the way down the metatarsus. The check ligament resembles that of the fore 

 limb, except that it is longer and very much weaker; it may be absent.^ The re- 

 mainder of the tendon is arranged like that of the thoracic limb. 



Tendon of 

 gastrocnemius 



Superficial 



Tibialis 

 anterior 



Synomnl 

 sheath 



Tendon of per- 

 oiieus terlius 



Tibial tarsal bone 



iledial tendo 

 tibialis anterior 



flexor tendon 



Calcanean 

 bursa 



- Tuber calcis 



Subcutaneous 

 thickening 



T I"! I Plantar liga- 



Deep flexor 



tendon 



Tarsal sheath 



Superficial flexor 

 tendon 

 Annular ligament 



Joint capsule (tarso- 

 metatarsal ligament) 



Fourth tarsal 

 Perforating tarsal vein 

 Check ligament 

 Suspensory ligament 



Fig. 299. — Sagittal Section of Hight Hock of Horse. 

 The section passes through the middle of th<> groove of the trochlea of the tibial tarsal bone. 1, 2, Proximal ends 

 of cavity of hock joint; 3, thick part of joint capsule over which deep flexor tendon plays; 4, fibular tarsal bone (sus- 

 tentaculum). A large vein crosses the upper part of the joint capsule (in front of 1). 



Joint cavity 

 Dorsal ligament 

 Central tarsal bone 

 Third tarsal bone 



Ml. Ill 



Relations. — Anteriorly, the tibia and fibula, the popliteus, lateral extensor,, 

 tibialis anterior, and the tibial vessels; posteriorly, the gastrocnemius, superficial 

 flexor, and the tibial nerve; laterally, the fascia, skin, and the soleus; medially, 

 the fascia and skin. 



' This might well be called the tarsal (tendinous) head of the deep flexor. 



