MICROANATOMY

Detailed explanation-1: -Anterior Interosseous nerve (AIN) syndrome is a rare syndrome that comprises less than 1% of all upper extremity nerve palsies, arising due to compression or inflammation of the AIN of the forearm. The AIN is purely a motor branch of the median nerve that arises from its dorsomedial aspect, just inferior to the elbow.

Detailed explanation-2: -Signs and symptoms Lack of ability to abduct and oppose the thumb due to paralysis of the thenar muscles. This is called “ape-hand deformity". Sensory loss in the thumbs, index fingers, long fingers, and the radial aspect of the ring fingers.