DISTRIBUTION OF THE SENSORY ENDINGS OF THE C7 NERVE ROOT AND ITS CLINIC SIGNIFICANCE

50 patients with root avulsion of the brachial plexus have been treate d with contralateral C7 root neurotization. Abnormal cutaneous sensati on was found on the index finger in 37 cases (74%), on the middle fing er in 29 cases (58%), on the thumb in 19 cases (38%), on the ring fing er in ten cases (20%), and on the little finger in one case (2%). Seve n patients had no abnormal cutaneous sensation. It is suggested that t he area of skin innervated by C7 is centred on the index finger, toget her with the thumb and middle fingers.