8o . EQUINE ANATOMY. 



POPLITEUS. 



Origin. Outside external condyle of femur. 

 Insertion. Into triangular surface on posterior surface of tibia 

 at its upper portion. 



Action. Flexes tibia and rotates it outward. 

 Nerve. Great sciatic. 



FLEXOR PROFUNDUS DIGITORUM OR PERFORANS. 



Origin. To external tuberosity and posterior surface of tibia 

 fibula and interosseous ligament. 



Insertion. Passes through tarsal sheath on inner side of os 

 calcis and into semilunar crest of os pedis. 



Action. Flexes phalanges on each other and on metatarsus. 



Nerve. Great sciatic. 



OBLIQUE FLEXOR OF PHALANGES. 



Origin. External tuberosity of tibia. 

 Insertion. Upper third of metatarsus. 

 Action. With preceding. 

 Nerve. Great sciatic. 



POSTERIOR FOOT. 



Two lumbricales and two inter ossei, as in anterior foot. 



PEDAL MUSCLE. 



Origin. Lower end of os calcis and astragalus. 

 Insertion. Into tendons of extensors of phalanges. 

 Action. Aids in extending digit and flexing hock. 

 Nerve. Plantar. 



COCCYGEAL REGION. (3 PAIRS.) SACRO-COCCYGEUS SUPERIOR. 

 Origin. From side of spinous processes of last 3 or 4 sacral 

 vertebrae. 



Insertion. Into coccygeal vertebrae. 



Action. Elevates tail or carries it to one side. 



Nerve. Coccygeal. 



SACRO-COCCYGEUS INFERIOR. 



Origin. From third portion of sacrum, internal surface of 

 sacro- sciatic ligament. 



