![]() ![]() They relay information between your brain and the rest of your body. Peripheral nerves reside outside your brain and spinal cord. Central nervous system (brain and spinal cord). ![]() Peripheral nerves are an integral part of the human nervous system. At the same time, these nerves deliver messages to the brain that bring information about the angles and position of joints, the length and tension of muscles, or even the speed of movements so that through the interaction of the nervous system with the muscles of the lower extremities, balance may be maintained.If a peripheral nerve condition is affecting your quality of life, turn to UC San Diego Health for expert care for nerve pain, nerve compression injuries, nerve trauma, and other disorders of the peripheral nerves. Working together, the plantar nerves command the many small muscles of the feet and toes to create the constant, subtle shifting of the feet that keeps us from falling down. The medial and lateral plantar nerves are the two largest nerves in the bottom of the foot. The sural nerve branches from the tibial and common fibular nerves and is responsible for feeling on the outside of the foot and the small toe. All of these nerves extend as branches of nerves in the leg that pass through the ankle and into the foot. The nerves of the foot help move the body and keep balance both while it’s moving and at rest. Along its route through the legs, the sciatic nerve splits into the tibial and common fibular (peroneal) nerves, which in turn split into many smaller nerves in the legs and feet. It descends from the sacral plexus through the buttocks and into the thighs to supply nerve impulses to and from the muscles and skin in the hip joints and thighs, the lower legs, feet and most of the skin below the knee. One of the body’s largest and longest nerves is the sciatic nerve. The obturator nerve connects to the adductor muscles and skin in the groin, while the lateral femoral cutaneous nerve connects to the skin on the anterior, posterior, and medial regions of the thigh. The branches of the femoral nerve serve the quadriceps muscles and skin of the anterior and medial thigh, while its largest branch, the saphenous nerve, extends to the skin of the medial leg and foot. Each of these major nerves further divides into many smaller nerve branches to stimulate individual muscles and sense touch, pain, warmth, and cold in the skin. The femoral, saphenous, obturator, and lateral femoral cutaneous nerves all extend from the lumbar plexus into the muscles and skin of the thigh and leg. The lumbar plexus forms in the lower back from the merger of spinal nerves L1 through L4 while the sacral plexus forms in the pelvic region from spinal nerves L4, L5, and S1 through S4. As these nerves descend toward the thighs, they form two networks of crossed nerves known as the lumbar plexus and sacral plexus. The nerves of the leg and foot arise from spinal nerves connected to the spinal cord in the lower back and pelvis. Reflexes help to maintain proper muscle tone, balance, and responsiveness of the legs and feet to stimuli such as stepping on a sharp object. The nerve signals in these reflexes come from stretch receptors located in the joints, ligaments, tendons, and even the muscles themselves. However, many reflex pathways are also active in the legs and foot. The motor regions of the brain and spinal cord control most of the nerve impulses that stimulate muscles in this region. Primarily, this section of the peripheral nervous system sends and receives signals regarding locomotion and balance of the body. Sensory nerves are of course present throughout the lower extremities however, with the exception of the bottom of the foot, they play a lesser role here than in the upper extremities. The nerves of the leg and foot serve to propel the body through the actions of the legs, feet, and toes while maintaining balance, both while the body is moving and when it is at rest. ![]()
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