C8-t1

Injuries to the C8-T1 roots produce distinct clinical syndromes that differ significantly from injuries to the upper roots (C5-C6).

The "C8-T1" term refers to the nerve roots at the base of the neck and the very top of the chest, which together form the lower trunk of the brachial plexus . These nerves are primarily responsible for the motor function of the hand and sensation along the medial (inner) side of the forearm and hand . Clinical Significance of C8-T1 Injuries to the C8-T1 roots produce distinct clinical

| Test | What it assesses | |------|------------------| | Grip strength (dynamometer) | C8 (FDP, FPL) | | Finger cross (abduction against resistance) | Dorsal interossei (C8/T1) | | Froment’s sign (paper pinch) | Adductor pollicis (ulnar – C8/T1) vs FPL (median) | | Wartenberg sign (little finger abduction at rest) | Dorsal interossei weakness | | Medial forearm sensation | T1 | | Ring & little finger sensation | C8 | | Horner’s check (ptosis, miosis, anhidrosis) | T1 sympathetic | Clinical Significance of C8-T1 | Test | What

Issues at these levels, such as (pinched nerves), often mimic ulnar neuropathy (cubital tunnel syndrome) because both affect the inner hand. Differentiating C8–T1 Radiculopathy from Ulnar Neuropathy Because of their low position in the neck

(C8–T1 mainly) – not pure root lesion, but mimics C8/T1 radiculopathy.

Together, these two roots contribute fibers to the , specifically forming the Inferior Trunk . Because of their low position in the neck and their path over the first rib, they are mechanically vulnerable to compression and traction injuries.