Q. The psoas major muscle:
flexes the thigh at the hip
extends the thigh at the hip
adducts the thigh at the hip
abducts the thigh at the hip
assits in full contraction of the diaphragm
The psoas major joins the iliacus muscle, which originates broadly over the inner aspect of the iliac wing of the pelvis, to become the iliopsoas and insert on the lesser trochanter of the femur and flex the thigh at the hip.