pelvic muscles

What is the origin of the psoas major muscle?

Lateral aspect of the T12–L4 vertebral bodies
Anterior aspect of the costal processes of L1–L5 vertebrae

Where does the psoas major muscle insert?

Its tendon fuses with the iliacus and inserts on the lesser trochanter.

What is the origin of the iliacus muscle?

Iliac fossa

Where does the iliacus muscle insert?

Its tendon fuses with the psoas major and inserts on the lesser trochanter.

What forms the iliopsoas muscle?

Fusion of the psoas major and iliacus muscles.

What is the insertion of the iliopsoas muscle?

On the lesser trochanter.

List the actions of the iliopsoas muscle.

Flexion of the thigh upon the pelvis
Lifting the thigh over the horizontal plane
Propelling the thigh forward while walking
Lateral rotation of the thigh
Adduction of the thigh
Flexion of pelvis and vertebral column (when femur is fixed)

What nerves innervate the iliopsoas muscle?

Collateral branches from L1–L3 (lumbar plexus)
Femoral nerve (L1–L4)