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Nerves in your thumb

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Last Updated: March 24, References Approved. This article was co-authored by Chris M. Matsko, MD. Chris M. Matsko is a retired physician based in Pittsburgh, Pennsylvania.
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Nerves of the Arm and Hand

Peripheral outside of the central nervous system nerves are tubes that are special in their ability to transmit electric impulses along their length and into or away from the central nervous system. Nerves have specialized receptors for different inputs like hot, cold, sharp and vibration. Smaller nerves are grouped into larger rope-like groups that travel up and down the body. The ulnar nerve is formed from the C8 and T1 nerve roots. The C8 and T1 roots are part of the brachial plexus that travels from the cervical spine, under the clavicle, through the armpit axilla , and down the inside of the arm to the inner elbow.
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Causes of a Numb Thumb or Hand

The nerves of the arm and hand perform a substantial two-fold role: commanding the intricate movements of the arms all the way down to the dexterous fingers, while also receiving the vast sensory information supplied by the sensory nerves of the hands and fingers. The movements of the arms must be fast, precise, and strong to complete the diverse activities the body engages in throughout the day. Even the tiny hand muscles, which perform very delicate and precise movements, are driven by about , neurons.
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Your hands are exposed to potential dangers as you perform daily tasks, making your fingers susceptible to a variety of injuries. Finger cuts are often minor and usually heal without complications. However, numbness in a cut finger signifies that a nerve has been damaged. This is a serious situation that requires urgent medical attention to prevent long-term consequences. Nerves in the fingers give sensation to the overlying skin, including the ability to tell the difference between hot and cold.
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