826 



Diseases of the (re?iital Organs 



synovial sac, as shown in Fig. 236. The two synovial cavi- 

 ties became so distended, when the foal was two or three 

 days old, that each patella was pushed away from the troch- 

 lear groove of the femur, floated above the summit of the 

 external ridge, and became completely dislocated laterally, 

 wholly disabling the posterior limb. The foal was therefore 

 unable to stand erect either before or behind. The disease 

 is apparently not local, but merely the local evidence of sys- 

 temic disturbances. In lying down and getting up, the ex- 



FPA 



Fig. 237 -Rupture of the Extensor Pedis Longus Muscle 



in New-Born Foal. 



Right anterior linih seen from in front. 



EM, Extensor metacarpus; EP, extensor pedis longus; EPA, extensor 



pedis longus accessorius ; /. Proximal ruptured end; j, distal 



portion of tendon dropped down in sheath, ,\ 



