Psoas Major Muscle – Detailed Anatomy Explained The psoas major is a long, thick, fusiform muscle located deep in the posterior abdominal wall. It plays a crucial anatomical role by directly linking the lumbar spine to the lower limb, making it one of the most important muscles for posture, trunk stability, and hip movement. Because of its deep location, it is often referred to as a core muscle rather than a superficial hip flexor. Origin: Anatomically, the psoas major originates from the antero

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