Large lumbar muscle
Large lumbar muscle , m. Psoas major, long, spindle-shaped, begins with 5 prongs from the lateral surface of the XII thoracic bodies, the four upper lumbar vertebrae and the corresponding intervertebral cartilage. Deeper muscle bundles originate from the transverse processes of all lumbar vertebrae. Slightly tapering, the muscle is directed down and slightly outward and, connecting with the ileal fascicles, m. Iliacus, forms the common iliac-lumbar muscle, m. Iliopsoas.
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