DNA replication is one of the most basic processes that occurs within a cell. Each time a cell divides, the two resulting daughter cells must contain exactly the same genetic information, or DNA, as the parent cell.
Other, less common causes of radial nerve palsy in the arm include compression at the fibrous arch of the lateral head of the triceps and compression by an accessory subscapularis-teres-latissimus muscle.
1 Ulnar nerve palsy is a condition caused by damage to the ulnar nerve. Damage is usually the result of illness, injury, or too much pressure on the ulnar nerve.  People with ulnar nerve palsy typically have tingling or complete loss of sensation in their fourth and fifth fingers.