72 EQUINE ANATOMY. 



of perforatus, and is attached by means of plantar aponeurosis 

 into semi-lunar crest of os pedis. 



Action. Flexes third phalanx and also whole foot. 



Nerve. Ulnar. J 



ANTERIOR FOOT. 



They comprise two lumbricales and two interossei. 



LUMBRICALI. 



Origin. From right and left side of perforans tendon. 

 Insertion. Into fibrous tissue of the fetlock. 



INTEROSSEI. 



Origin. Anteriorly between metacarpal bones. 

 Insertion. Into .anterior extensor of phalanges. 

 Action. With extensor. 

 Nerve. Ulnar. 



POSTERIOR EXTREMITY. 



PELVIC REGION. GREAT PSOAS. 



Origin. From bodies of last two dorsal and first five lumbar 

 vertebrae, inferior surface of last two ribs and lumbar transverse 

 processes. 



Insertion. Internal trochanter. 



Action. Flexor and external rotator of thigh. 



Nerve. Iliaco-muscular. 



ILIO-PSOAS. 



Origin. Whole iliac surface, external iliac angle, sacro-iliac 

 ligament and ilio-pectineal crest. 

 Insertion. With preceding. 

 Action. Same. 

 Nerve. Iliaco-muscular. 



SMALL PSOAS. 



Origin. Bodies of three or four last dorsal and all lumbar 

 vertebrae. 



Insertion. Ilio-pectineal eminence and ilio-lumba'r aponeurosis. 

 Action. Flexes pelvis on spine, or spine on pelvis. 

 Nerve. Iliaco-muscular. 



