Which core stabilization muscle is part of the pelvic floor?

• A. Psoas major
• B. Quadrates lumborum
• C. Transverse abdominis
• D. Pelvic floor muscles

Answer: (D)

The pelvic floor muscles form the base of the core, providing support for pelvic organs and helping to regulate intra-abdominal pressure. They work together with the diaphragm, transverse abdominis, and other deep stabilizers to keep the spine and pelvis stable during movement. Among the options, only the pelvic floor muscles themselves are part of this pelvic-floor–related stabilization system. The psoas major is a hip flexor, the quadratus lumborum stabilizes the lower back but isn’t part of the pelvic floor, and the transverse abdominis is a deep abdominal muscle that supports the core but isn’t the pelvic floor. Training core stability often emphasizes coordinating breathing with pelvic floor activation to optimize spinal support.