LIGAMENTS AND MUSCLES OF THE HORSE. 51 



1. Triceps Abductor Femoris. 



Origin. — From the sacral spines, sacro-sciatic ligament, and 

 tuberosity of the ischium. 



Insertion. — To the back of the femur between the two trochan- 

 ters, to the patella, to the tibial crest, atid to the fascia of 

 the thigh. 



Action. — The anterior part of the muscle extends the stifle, and 

 abducts the hip ; the posterior part flexes the stifle and 

 rotates it outwards. When the leg is fixed, it assists in 

 rearing. 



2. Biceps Rotator Tibialis. 



Origin.— '^a.GvaX spines, sacro-sciatic ligament, and tuberosity of 



the ischium. 

 Insertion. — To the tibial crest. 

 Action. — To flex the stifle and rotate the leg inwards. Or to 



aid in rearing. 



3. Adductor Magnus. 



07'igin. — From the inferior surface and tuberosity of the ischi- 

 um, and from the coccygeal fascia. 

 Insertion. — To the internal condyle of the femur. 

 Action. — To adduct and extend the hip ; or to assist in rearing. 



INTERNAL FEMORAL REGION. 



1. Sartori'iis. 6. Ischio-femoralis. 



2. Gracilis. 7. Obturator externus. 



3. Pectineas. 8. Obturator internus 



4. Adductor b7'evis. 9. Pyriformis. 



5. Adductor longus. 10. Gemellus. 



1. Sartorius. 



Origin. — From the iliac fascia, near the tendon of the psoas 



parvus. 

 Insertion. — To the internal straight ligament of the patella. 

 Action. — To adduct the leg, and flex the hip. 



