156 EQUINE ANATOMY. 



uni, sacro-iliac ligament, ilio-pectineal crest and the 

 internal trochanter. Action : Flexor and rotator of 

 the thigh. 



3. Small psoas. — Synonyms. Psoas of the loins, 

 (B). Sub-lumbo pubialis or iliacus, (G). Psoas par- 

 vus (P). Lumbo-iliacus (L). It is semi-penniform. 

 Attachments : On the body of the three or four last 

 dorsal and of all the lumbar vertebrae, ilio-pectineal 

 eminence, and lumbo-iliac aponeurosis. Action : Flexor 

 of the pelvis on the spine, arches directly or laterally 

 the ischio-lumbar region, tensor of the lumbo-iliac 

 aponeurosis. 



4. Square muscle of the loins. — Synonyms. Sacro- 

 costalis, (G). Sacro-lumbalis, (P). Attachments : The 

 sacro-iliac ligament, posterior border of the last rib, 

 the transverse processes of the lumbar vertebrae, the in- 

 ternal face of the three or four last ribs. Action : 

 Draws the ribs backwards and inclines the lumbar por- 

 tion of the spine. 



5. Inter-transversal of the loins. — Synonyms. 

 Inter-transversalis lumborum, (P). Atta3hments : The 

 anterior and posterior border of the transverse processes 

 of the lumbar vertebrae. Action : These five muscles 

 incline the lumbar region laterally. 



