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vertebral column with erector spinae reflected
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In this image the erector spinae muscles (blue pins) have been reflected upwards and laterally to show the spinous processes and the vertebral column (the tranversospinalis muscles made up of the semispinalis, multifidus, and rotatores have been removed). Recall that ligamentum flava run between the laminae of adjacent vertebrae and are important in limiting vertebral flexion.

The L4 spine is located in the same transverse plane as the supracristal plane (a plane across the highest points of the iliac crests).

As a general rule, a slipped disc will affect the spinal nerve with the same designation as the lower bounding vertebra (though there are different reasons for this depending on the region of the spine). For instance, a slipped C4/C5 intervertebral disc will typically compress the C5 spinal nerve and a slipped L4/L5 intervertebral disc will typically compress the L5 spinal nerve.
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