Forefinger disappears

The injury of the median nerve of the hand is as follows: thumb abduction dysfunction caused by brachial abductor palsy and thumb, index finger pinch dysfunction, radial half of the palm, thumb, forefinger, and neutral half of the radial palm of the ring, thumb thumb Sensory disturbances of the interphalangeal joints and forefinger, middle and ring fingers, semi-proximal radial and proximal interphalangeal joints, mainly manifested by the disappearance of index finger sensation.