Origin
T12, L1 vertebrae.
Insertion
Pelvic bone – pectineal line, iliopectineal eminence.
Blood supply
Lumbar arteries, iliolumbar artery.
Nerve supply
L1 nerve.
Action
It is a weak muscle and helps to bend the lower back. It plays very little role in moving the hips.
Disease/Injury
Psoas minor muscle strain is common in athletes and sportsmen. It gives rise to difficulty in running and jumping.
Muscle Exercise
To strengthen psoas minor muscle you can perform leg raises. Lie on your back and raise your right leg up until it is at 90 degrees to your trunk. Hold and bring it down slowly, but do not touch the floor. A few inches above the floor, raise the leg again. Do 15 repetitions and repeat the same with the other leg.
Interesting facts
This muscle is not present in almost 40-50 % of human beings.
