psoas

The larger of two muscles that originate in the lower spine. This muscle flexes the hip.

The smaller of two muscles that originate in the lower spine. This muscle flexes the lower spine.

A muscle of the loins and pelvis; the tenderloin.

An internal muscle arising from the lumbar vertebræ and inserted into the femur. In man there are usually two on each side, and the larger one, or great psoas, forms a part of the iliopsoas.

Either of two muscles, the psoas major and psoas minor involved in flexion of the trunk

either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh