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The L4 spinal nerve roots exit the spinal cord through small bony openings (intervertebral foramina) on the left and right sides of the spinal canal. These nerve roots join with other nerves to form bigger nerves that extend down the spine and travel down each leg.
The fourth lumbar spinal nerve (L4) [4] originates from the spinal column from below the lumbar vertebra 4 (L4). 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 L3-L4 spinal motion segment, positioned in the middle of the lumbar spine, plays an important role in supporting the weight of the torso and protecting the cauda equina (nerves that descend from the spinal cord).
L1 spinal nerve provides sensation to your groin and genital area and helps move your hip muscles. L2, L3 and L4 spinal nerves provide sensation to the front part of your thigh and inner side of your lower leg. These nerves also control hip and knee muscle movements.
There are 5 pairs of lumbar spinal nerves that progressively increase in size from L1 to L5. These nerves exit the intervertebral foramina below the corresponding vertebra. For example, the L4 nerve exits beneath the L4 vertebra through the L4-L5 foramen.
Each lumbar spinal nerve exits below its corresponding vertebra—for example, the L4 nerve exits below the L4 vertebra through the L4-L5 neural foramen. Most lumbar disc herniations occur centrally and do not compress the exiting nerve root at the level of the disc.
A limited description of the specific lumbar spinal nerves includes: L1 innervates the abdominal internal obliques via the ilioinguinal nerve; L2-4 innervates the iliopsoas, a hip flexor, and other muscles via the femoral nerve; L2-4 innervates the adductor longus, a hip adductor, and other muscles via the obturator nerve; L5 innervates ankle ...
They are divided into sympathetic and parasympathetic fibres. Sympathetic fibres originate from the thoracic spinal nerves as well as L1 and L2. Parasympathetic nerves come from the S2, S3, and S4 spinal nerves only to supply the pelvic and lower abdominal
Lumbar plexus: Spinal nerves L1 through L4 converge to form the lumbar plexus. This plexus splits into nerves that carry sensory messages and provide motor control to the muscles of the abdomen and leg.
Spinal stenosis happens when the space inside the backbone is too small. This can put pressure on the spinal cord and nerves that travel through the spine. Spinal stenosis happens most often in the lower back and the neck. Some people with spinal stenosis have no symptoms. Others may experience pain, tingling, numbness and muscle weakness.