24/05/2026
Iliopsoas & Quadratus Lumborum Region — Core Muscles Linking the Spine, Pelvis & Hip. Analysis by Dr. Muhammed Ziya
“▪️The iliopsoas and quadratus lumborum (QL) muscles are deep stabilizing muscles of the lower back and pelvis. They play a major role in posture, walking, hip movement, spinal stability, and pelvic balance.
▪️This anatomical region is closely related to important nerves, blood vessels, abdominal organs, and the lumbar plexus.
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🟣 Main Structures Shown in This Diagram
🔹 Psoas Major Muscle
➟ A deep hip flexor connecting the lumbar spine to the femur.
➟ Essential for walking, running, and lifting the leg.
🔹 Iliacus Muscle
➟ Works together with the psoas major as the iliopsoas muscle group.
🔹 Quadratus Lumborum (QL)
➟ Stabilizes the lumbar spine and pelvis during standing and walking.
🔹 Lumbar Plexus
➟ A network of nerves supplying the lower abdomen, pelvis, and legs.
🔹 Iliac Blood Vessels
➟ Major arteries and veins supplying the pelvis and lower limbs.
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🟣 Important Functions of the Iliopsoas Muscle
🔹 Hip flexion
➟ Helps raise the thigh during walking or climbing stairs.
🔹 Postural stability
➟ Maintains upright posture and spinal alignment.
🔹 Lumbar spine support
➟ Assists in stabilizing the lower back during movement.
🔹 Pelvic balance
➟ Works with abdominal and gluteal muscles to maintain pelvic mechanics.”
Image: Author
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