74 EQUINE ANATOMY. 



QUADRATUS LUMBORUM. 



(A) Primary Fasciculus. 



Origi7t. — 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. 



Rons between lumbar transverse processes. 

 Action. — Inclines lumbar region laterally. 

 Net ve. — Lumbar. 



Gluteal Region. — superficial gluteal. 



Origin. — Internal aspect of gluteal aponeurosis, postero-exter- 

 nal iliac angle and ischiatic ligament. 

 Iftsertion. — 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. 

 Insej'tion. — 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. 



