Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Lumbar spinal nerve 4
Introduction
The lumbar spinal nerve 4 (L4) is a spinal nerve of the lumbar segment.[1].
It originates from the spinal column from below the lumbar vertebra 4 (L4).
Muscles
Muscles
L4 supplies many muscles, either directly or through nerves originating from L4. They are not innervated with L4 as single origin, but partly by L4 and partly by other spinal nerves. The muscles are: