C8 T1 Nerve Roots Jun 2026

The C8 and T1 nerve roots are anatomically contiguous structures emerging from the spinal column at the cervicothoracic junction. The C8 root exits between the C7 and T1 vertebrae, while the T1 root exits between the T1 and T2 vertebrae. Together, they form the lower trunk of the brachial plexus, which subsequently divides into the anterior and posterior divisions to give rise to the ulnar nerve, median nerve (medial root), and radial nerve (posterior cord contributions).

The C8 and T1 nerve roots are responsible for controlling various motor and sensory functions. The C8 nerve root primarily supplies the muscles of the forearm, including the flexor digitorum profundus, flexor pollicis longus, and pronator quadratus. It also provides motor innervation to the thenar muscles of the thumb. c8 t1 nerve roots

While the upper cervical roots (C5, C6, and C7) govern the large, powerful movements of the shoulder and elbow, C8 and T1 are the architects of fine motor control and grip. Understanding their anatomy and clinical presentation is essential for diagnosing conditions ranging from thoracic outlet syndrome to cervical disc herniations. The C8 and T1 nerve roots are anatomically