Anatomy General 7461fd87 Flexor of lumbar spine is/are: A Erector spinae B External oblique muscle C Internal oblique muscle D Rectus abdominis High-Yield Explanation D i.e. Rectus abdominisRectus abdominis, psoas major & gravity are principal flexors of thoracolumbar veebraeQ. Mn-"Bilateral Major GRAP"