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Lumbar spine. Coloured X-ray of four lumbar vertebrae of the human spine, seen in antero- posterior view. Five lumbar bones are found in the lower back, with those here being: L1 (at top) to L4 (at bottom). Part of L5 which articulates with the sacrum of the pelvis is seen below L4. The lumbar vertebrae are the largest of the un- fused vertebrae in the backbone. Each vertebra comprises a wide disc-like body, with transverse bony processes projecting out sideways. These bony processes are muscle attachment points. Between each vertebra is a cartilaginous disc. A canal inside each vertebra accommodates the spinal cord. The spine is made up of 33 vertebrae.
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