Question

multiple choice question
what muscle is responsible for flexion and rotation of the lumbar portion of the vertebral column?
internal intercostals
rectus abdominis
linea alba

Explanation:

The rectus abdominis muscle is involved in flexion and rotation of the lumbar portion of the vertebral column. Internal intercostals are related to rib - cage movement, and linea alba is a fibrous structure, not a muscle responsible for lumbar flexion and rotation.

Answer:

Rectus abdominis