1 Axial pain. 2  Also called mechanical pain, axial pain is the most common cause of back pain and may present in a number of different ways (sharp or dull, constant, comes and goes, etc.). 3  A muscle strain is a common cause of axial pain.ommon anatomical causes of back pain include: 1  The large nerve roots that go to the legs and arms may be irritated. 2  The smaller nerves that innervate the spine may be irritated. 3  The large paired back muscles (erector spinae) may be strained. 4  The bones, ligaments, or joints themselves may be injured.
Merge this question into. Split and merge into it. Answer by Puhlaa. Confidence votes 4.9K. The spinal cord enlarges at the cervical and lumbosacral areas in order to accomodate the extra neurons involved with the motor control going to, and sensations coming from, the upper and lower limbs.
Lumbar spinal stenosis is a narrowing of the spine in the lower part of your back. Stenosis, which means narrowing, happens when your vertebrae, or the bones of your back, put pressure on your spinal cord or the nerves that pass out from your spinal cord to your muscles.Your spinal cord is a bundle of nerves that runs through a tunnel formed by your vertebrae called the spinal canal.Spinal stenosis can happen in any part of your spine but is most common in the lower back. This part of your spine is called your lumbar area. Five lumbar vertebrae connect your upper spine to your pelvis.our spinal cord is a bundle of nerves that runs through a tunnel formed by your vertebrae called the spinal canal. Spinal stenosis can happen in any part of your spine but is most common in the lower back. This part of your spine is called your lumbar area.