Posterior abdominal wall

Question 1

What are the muscles of the posterior abdominal wall?

Answer 1

PSOAS MAJOR-flexor of the thigh of the trunk

PSOAS MINOR-minor flexor of trunk (not always present)

QUADRATUS LUMBORUM-Stabiliser of the 12th rib, flexor and lateral flexor of the trunk

ILIACUS forms complex with Psoas major and their combined tendon inserts into the thigh to help flex it

Question 2

Where does the Quadratus lumborum lie?

Answer 2

From the posterior of the Iliac crest upto the Inferior margin of the 12th rib

Question 3

Where does Psoas major lie?

Answer 3

attatchment form T12 ton L5

Question 4

What does the Iliacus muscle line?

Answer 4

Interior surface of the wing of the Ilium and they form a combined tendon which inserts into the lesser trochanter of the femur

Question 5

Which of the 4 muscles of the Posterior abdominal wall can act on the spine and which can act on the thighs?

Answer 5

• All can act on the spine

- only the PSOAS MAJOR can act on the spine

Question 6

What muscles do the aponeurosis form sheaths around?

Answer 6

Quadratus Lumborum and erector spinae