Flexors of lumbar spine are all EXCEPT:: (A) Erector spinae, (B) External oblique muscle, (C) Internal oblique muscle, (D) Rectus abdominis
Answer is A. Forward flexors: Rectus abdominis, external abdominal oblique, internal abdominal obliques, transversus abdominis and iliacus-psoas. Lateral flexors: Ipsilateral contraction of the oblique and transversus abdominal muscles and quadratus lumborum.