Spine

Spinous process of L4

Processus spinosus vertebrae lumbalis IV

How to find it

At the level of the line between both iliac crests, in the midline.

What you use it for

The counting point for the lumbar levels, and the reference for a lumbar puncture or for locating a radicular level.

On the bone

Lumbar vertebrae (L4)

Body region

Spine