Quadratus Lumborum And Psoas

Question 1

What is the origin and insertion of Quadratus lumborum?

Answer 1

O: Posterior Iliac crest
Iliolumbar ligament
I: TPs of L1-4 and 12th rib

Question 2

What is the action of Quadratus lumborum?

Answer 2

Unilateral: ipsilateral lateral flexion when hip is flexed
elevates pelvis on same side when spine is fixed
Bilateral: stabilizes spineassist expiration

Question 3

What is the origin and insertion of psoas major?

Answer 3

O: TPs and lateral VBs/IVDs from t12-l5
I: Lesser trochanter of femur

Question 4

What is the action of psoas major?

Answer 4

Flexion of femur
External rotation of femur
Flexion of lumbar spine
*contributes to lordosis

Question 5

What is the origin and insertion of psoas minor?

Answer 5

O: lateral aspect of t12 VB
I: iliopectineal eminence

Question 6

What is the action of psoas minor?

Answer 6

Lumbar flexion

Question 7

What is the origin and insertion of iliacus?

Answer 7

O: iliac fossa
I: lesser trochanter of femur

Question 8

What is the action of iliacus?

Answer 8

Hip flexion

Internal rotation