Chapter 5 (The Posterior Abdominal Wall)

Question 1

Muscles of the posterior abdominal wall

Answer 1

• Psoas major
• Ilacus
• Quadratus lumborum

Question 2

Psoas major

Answer 2

Lies lateral to the lumbar vertebrae together with the iliacus will form the iliopsoas (the chief flexor of the thigh), also laterally flexes the vertebral column.

Question 3

Iliacus

Answer 3

Large triangular muscle that lies along the side of the inferior part of teh psoas major helps form the iliopsoas, also acts as a stabilizer of the hip joint and helps maintain the erect posture at this point

Question 4

Quadratus lumborum

Answer 4

Forms a thick muscular sheet in the posterior abdominal wall, extends and laterally flexes the vertebral column.