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The psoasmuscle is a majormuscle in the human body, responsible for stabilizing the base of the spine, allowing the spine to flex, and rotating the hips for a free range of movement.
The start of the psoasmuscle is found in the lumbar, or lower spine, where the paired psoasmuscles anchor on either side of the spine.
The psoasmuscles are considered to be crucial among the hip flexor muscles.
It passes obliquely through the substance of the Psoasmajor, and emerges from its medial border, close to the vertebral column, opposite the fibrocartilage between the third and fourth lumbar vertebræ; it then descends on the surface of the Psoasmajor, under cover of the peritoneum, and divides into the external spermatic and lumboinguinal nerves.
It descends through the fibers of the Psoasmajor, emerging from the muscle at the lower part of its lateral border, and passes down between it and the Iliacus, behind the iliac fascia; it then runs beneath the inguinal ligament, into the thigh, and splits into an anterior and a posterior division.
The articular branch to the hip-joint is derived from the nerve to the Rectus femoris.
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