Body & anatomy

Lumbar spine

The lumbar spine is the lower-back region of the spine. It usually contains five vertebrae, labeled L1 through L5, and supports much of the upper body’s weight.

In everyday words

Lumbar support refers to support around the lower back, such as an adjustable part of a chair. Lumbar movement means movement involving this spinal region.

What to keep in mind

Knowing where pain is felt does not establish which tissue is responsible. A clinician considers symptoms, function, and examination findings together.

Body & anatomy
Vertebrae
Vertebrae are the bones that form the spine. The singular word is vertebra. Together, these bones provide support and form a protective passage for the spinal cord and nerves.
Body & anatomy
Sciatic nerve
The sciatic nerve is a large nerve on each side of the lower body. It forms from nerve roots in the lower spine, passes through the buttock and thigh, and divides into branches serving the lower leg and foot.
Movement basics
Core muscles
Core muscles are the muscles around your trunk and pelvis that help control and support your body during movement. The term includes more than the abdominal muscles at the front of your body.

In everyday words

What to keep in mind

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Vertebrae

Sciatic nerve

Core muscles