Because C8 contributes sensory fibers to the ulnar nerve and the medial antebrachial cutaneous nerve (inner forearm), the numbness follows a clear dermatome.
Note: Horner’s syndrome is a critical red flag. Its presence suggests a proximal lesion affecting the T1 root or lower trunk, often due to an apical lung tumor (Pancoast tumor), a cervical rib, or a traumatic avulsion. c8-t1 nerve damage symptoms
To understand the symptoms, one must first understand the anatomy. The spinal cord is encased within the vertebral column. Nerves exit the spinal cord through small openings called foramina. Because C8 contributes sensory fibers to the ulnar
For those with permanent deficits, occupational therapy is essential: To understand the symptoms, one must first understand
While sensory changes are annoying, the motor deficits caused by C8-T1 damage are often the most functionally limiting. These nerves supply almost all of the small, intricate muscles inside the hand (intrinsic muscles) and some muscles in the forearm.
The C8 and T1 nerve roots provide the majority of motor innervation to the small muscles of the hand (intrinsic muscles), the long finger flexors, and some wrist flexors. T1 is particularly critical for the hand's fine motor control. Damage leads to: