Which muscles comprise the Back group in pillar anatomy?

• A. Latissimus Dorsi, Trapezius
• B. Erector Spinae, Multifidus
• C. Rectus Abdominis, Obliques
• D. Gluteus Maximus, Hamstrings

Answer: (B)

The back group in pillar anatomy consists of the muscles that directly stabilize and extend the spine, forming the posterior pillar of the trunk. The two key players are the erector spinae and the multifidus. The erector spinae is a long muscle column running along the spine that generates trunk extension and assists with lateral bending and rotation, helping you stand upright and resist bending forward. The multifidus is a deep, segmental muscle that attaches to each vertebra, providing precise stabilization of each spinal segment so the spine can move safely under load. Together, these muscles are centered on supporting and controlling the spine itself, which is why they belong to the Back group.

The other options don’t fit as the primary spinal stabilizers. The rectus abdominis and obliques are front-of-trunk muscles that primarily flex and rotate the spine, contributing to the front pillar. Latissimus dorsi and trapezius are mainly involved with shoulder girdle and upper back movements rather than stabilizing the spine itself. Gluteus maximus and hamstrings belong to the posterior chain that mainly handles hip extension and leg movement, not the spine’s intrinsic stabilization.