The rump muscles are also made up of a number of different muscle groups and have considerably more groups than the girdle muscles. They extend between the ilium and the thigh. These muscles are particularly large in the horse, providing the power for forward locomotion. | The rump muscles are also made up of a number of different muscle groups and have considerably more groups than the girdle muscles. They extend between the ilium and the thigh. These muscles are particularly large in the horse, providing the power for forward locomotion. |