The psoas minor is a fairly small muscle that lies on the anterior side of the larger psoas major muscle. It acts as a weak flexor of the trunk. Some experts and medical professionals believe it has little affect on hip movement. The psoas major, however, rotates the hip laterally and flexes it. The psoas minor begins attached to the T12 and L1 vertebrae. This refers to the thoracic and lumbar spine and the intervertebral disc between them. It then travels down and attaches to the iliopubic eminence with a long tendon. The nerve that controls the psoas minor is the ant primary rami of L1. Oddly, 50 percent of people don't have a psoas minor muscle. Someone that has the muscle and strains it, however, can expect a 50 percent reduction in range of hip motion. To heal this type of injury, patients must first have corrective adjustments to properly align the spine and pelvis before performing a myofascial stretch.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Psoas minor