Median nerve

• Motor
  • superficial volar forearm group                                                                                                                          
  •  Pronator teres 
    •  Flexor carpi radialis
    •  Palmaris longus
  • intermediate group
    •  Flexor digitorum superficialis
  • deep group
    •  Flexor digitorum profundus (lateral)
    •  Flexor pollicis longus
    •  Pronator quadratus
  • hand
    •  1st and 2nd lumbricals
    •  Opponens pollicis
    •  Abductor pollicis brevis
    •  Flexor pollicis brevis

Origin

• Brachial plexus  
  • C5-T1 roots
    
    • medial and lateral cords

• Anterior compartment of arm
  • anterior compartment (anteromedial to humerus)
  • runs with brachial artery (lateral in upper arm / medial at elbow)
  • no branches in the arm
• Forearm
  • enters the forearm between the pronator teres and biceps tendon
  • travels between flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP)
  • then emerges between the FDS and flexor pollicis longus (FPL)
• Hand
  • the nerve then enters the hand via the carpal tunnel, along with the tendons of the FDS, FDP and FPL
• Terminal branches
  • anterior interosseous branch (AIN)
    • innervates the deep volar compartment of forearm except the ulnar half of the FDP
  • palmar cutaneous branch 
    • supplies sensory innervation to lateral palm
  • recurrent branch (to thenar compartment)
  • digital cutaneous branches
    • supply the radial 3 1/2 digits (palmar)
    • can also supply the index, long, and ring fingers dorsally

•  Carpal Tunnel Syndrome
•  AIN Neuropathy
•  Pronator Syndrome