Which muscles comprise the intrinsic sleeve?

• A. External obliques and rectus abdominis
• B. Transverse abdominus, diaphragm, pelvic floor, internal oblique, lumbar multifidi, interspinales, intertransversarii, psoas, and medial fibers of the quadratus lumborum
• C. Latissimus dorsi and gluteus medius
• D. Rectus abdominis and external obliques

Answer: (B)