The root value of the ulnar nerve is C8-T1.
The ulnar nerve is a major nerve in the upper limb responsible for motor and sensory functions. Understanding its root value is crucial for diagnosing and treating nerve-related conditions. Here's a breakdown:
- The ulnar nerve originates from the spinal nerve roots C8 and T1.
- These nerve roots are part of the brachial plexus, a network of nerves originating in the neck and shoulder.
- Specifically, the C8 and T1 nerve roots contribute to the medial cord of the brachial plexus.
- The ulnar nerve then arises as a terminal branch of the medial cord.
Therefore, any injury or compression affecting the C8 and T1 nerve roots or the medial cord can result in ulnar nerve dysfunction. This dysfunction can manifest as weakness or paralysis of certain hand muscles, as well as sensory loss in the ring and little fingers.
