Location

The C6 nerve root can be evaluated by testing sensation on the volar aspect of the thumb.

Significance

Loss of sensation should be correlated to the motor exam and associated reflex; in this case wrist extension.
http://www.orthopaedia.com/display/Main/C-6+Motor–Radial+Wrist+Extensors
http://www.orthopaedia.com/display/Main/Brachioradialis+Reflex+%28C6%29

A C6 radiculopathy is the most common because the C5-C6 disk is the cervical disk most susceptible to herniation or degeneration.

Sensory loss involving a more diffuse area, overlapping several dermatomes suggests a peripheral nerve injury.

The most sensitive way of assessing sensory loss is using two-point discrimination.

Figures

Attachments:


c6.JPG (image/jpeg)