Which muscle runs along the spine and contributes to spinal extension?

• A. Rectus Abdominis
• B. Latissimus Dorsi
• C. Erector Spinae
• D. Gluteus Maximus

Answer: (C)

The muscle that runs along the spine and contributes to spinal extension is the erector spinae. This group sits on either side of the vertebral column and runs from the lower back up to the neck. When both sides contract, it lengthens the spine, bringing you from a flexed position back to upright and supporting overall posture. It also assists with lateral bending and some rotation.

Consider the other muscles: the rectus abdominis is a front abdominal muscle that flexes the spine; the latissimus dorsi is a broad back muscle mainly involved in arm movements and shoulder extension rather than spine extension; the gluteus maximus extends the hip, not the spine.