The brachial plexus is a bundle of nerves that control movement to your chest, shoulders, arms, and hands. When these nerves are damaged, communication between the spinal cord and the extremities can be cut off, causing lack of movement or loss of feeling.
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A bundle of connected nerves in the neck region of your spinal cord sends branches down into your chest, shoulders, arms, and hands. This group of nerves is called the brachial plexus. These nerves control the motions of your wrists, hands, and arms, allowing you to raise your arm, type on your keyboard, or throw a baseball.
The brachial plexus nerves are sensory, too. For instance, they let you know that the pan you just grabbed with your hand is too hot to hold.
The brachial plexus can be injured in many different ways—from pressure, stress, or being stretched too far. The nerves may also be damaged by cancer or radiation treatment. Sometimes, brachial plexus injuries happen to babies during childbirth. In some cases, an overactive immune system can damage the plexus.
Brachial plexus injuries cut off all or parts of the communication between the spinal cord and the arm, wrist, and hand. This may mean that you can't move or feel parts of your arm or hand. Often, brachial plexus injuries also result in total loss of feeling in the area.
The severity of a brachial plexus injury varies. In some people, function and feeling returns to normal. Others may have lifelong disabilities because they can't use or feel a part of the arm.
Brachial plexus injuries are categorized by how badly the nerves are damaged:
Avulsion. The root of the nerve is completely separated from the spinal cord (the most severe type).
Neurapraxia. The nerves are stretched (the least severe type).
Rupture. Part of the nerve is actually torn.
Neuroma. Scar tissue forms on the stretched nerve as it fixes itself.
Brachial neuritis. This is a rare syndrome for which no cause can be identified. It's also called Parsonage-Turner syndrome.
Brachial plexus birth injury is when the brachial plexus gets stretched during childbirth. It is called Erb's palsy or Klumpke's palsy, depending on which part of the plexus is injured. Erb's palsy affects between 1 and 2 babies in every 1,000 births.
The most common type of injury happens when the neck is tilted while traction happens on the other side of the neck. But injuries are varied, including motor vehicle accidents, falls, gunshot wounds, athletic injuries (especially contact sports), and childbirth.
During childbirth, large babies may be at an increased risk for brachial plexus injuries. A quick or emergency delivery, when the baby must be forcibly pulled out, can result in a brachial plexus injury. This happens because the baby's neck is often flexed severely in one direction. Babies in breech position (bottom end comes out first) and those whose labor lasts an unusually long time may also suffer brachial plexus injuries.
Cancer and radiation therapy can both cause brachial plexus injury. The tumor itself can invade the brachial plexus. Radiation of lymph nodes in the area can also damage the nerves.
Symptoms depend on where along the length of the brachial plexus the injuries happen and how severe they are.
These are common symptoms of brachial plexus injuries:
No feeling in the hand or arm
Inability to control or move the arm, wrist, or hand
An arm that hangs limply
A healthcare provider will examine your hand and arm. He or she will test for feeling and function to help diagnose this type of injury.
These are other diagnostic tests often used:
Imaging tests, such as an MRI scan or CT scan
Tests to determine nerve function and electrical activity, including a nerve conduction study and electromyogram (EMG)
X-ray of the neck and shoulder area
Some brachial plexus injuries require surgery to repair the damage. Physical therapy can help you restore function in your arms and hands. It can also improve range of motion and flexibility in stiff muscles and joints.
Brachial plexus injuries don't always need treatment. Some people, particularly babies with a brachial plexus birth injury, get better without any treatment. But it can take as long as several months for the injury to heal. Certain exercises can help with healing and function.
You may need regular checkups to watch the progress and healing of a brachial plexus injury. Checkups are especially important for babies. They may be needed for as long as 2 years as the injury heals.
In some cases, a surgeon can connect other nerves or tendons to the muscles of the arm or hand to restore function. This is only done when the chance of spontaneous nerve growth becomes unlikely.
For severe brachial plexus injuries, prompt surgery could be needed to try to get function back. Without it, you might have a lasting disability and be unable to use your arm or hand.
If you have a brachial plexus injury resulting in a lack of feeling, you must take special care when dealing with hot items, razors, knives, or other objects that could harm you. A brachial plexus injury can keep you from feeling any other injury to the affected area. You may not notice that you're hurt.
You may also have long-term pain or sensory changes in the affected area. Or you could have paralysis.
If you have had an injury to the neck or shoulder area and you can't feel or move your hand or arm, call your healthcare provider to find out what's causing your symptoms
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