Action. - To flex the thigh on the pelvis and rotate it outwards. When both thighs are fixed it arches the back by flexing the spine. When a horse rears, this muscle is mainly concerned in preventing him falling backwards.
Fig. 376.-Muscles of the Lumbar and Pubio-Femoral Regions.
1, Intercostal Muscles. 2, Psoas Parvus. 3, Iliacus. 4, Quadratus Lumborum. 5, Sartorius. 6, Pubic Tendon. 7, Fascia. 8, Adductor Magnus. 9, Semitendinosus. 10, Rectus Femoris. 11, Adductor Longus. 12, Vastus Internus. 13, Adductor Brevis. 14, Pectineus.