74 EQUINE ANATOMY. 



QUADRATUS LUMBORUM. 



(A) Primary Fasciculus. 

 Origin. Sacro-iliac ligament. 



Insertion. Last rib and transverse lumbar processes. 



(B) Secondary Fasciculus. 

 Origin. From first. 



Insertion. Lumbar transverse processes and last two or three 

 ribs. 



Action. Draws last rib backward and inclines spine laterally. 

 Nerve. Lumbar. 



INTER-TRANSVERSE OF LOINS. 



Runs between lumbar transverse processes. 

 Action. Inclines lumbar region laterally. 

 Nerite. Lumbar. 



GLUTEAL REGION. SUPERFICIAL GLUTEAL. 



Origin. Internal aspect of gluteal aponeurosis, postero- 

 external iliac angle and ischiatic ligament. 

 Insertion. Third trochanter of femur. 

 Action. Abductor and external rotator of femur. 

 Nerve. Anterior gluteal. 



MIDDLE GLUTEAL. 



(Largest of three.) 



Origin. Gluteal aponeurosis, superior face and external angles 

 of ilium, sacro-iliac and sacro- sciatic ligaments. 

 Insertion. Trochanter major. 

 Action. Abductor of thigh, or assists in rearing. 

 Nerve. Anterior gluteal. 



DEEP GLUTEAL. 



Origin. Neck of ilium and supra-cotyloid ridge. 

 Insertion. Convexity of trochanter. 

 Action. Abductor and internal rotator. 

 Nerve. Posterior gluteal, 



