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C5, C6
Brachioradialis
C6-C7
Forearm Rotators (Pronator Teres, Supinator) + Radial Wrist Movers (FCR, ECRL)
C7-C8
Posterior Extensors (ECRB, ED, EDM, ECU, APL, EPL, EPB, EI) + Palmaris Longus
C7-T1
Flexor Digitorum Superficialis (FDS), Flexor Carpi Ulnaris (FCU)
C8, T1
Deep Anterior Flexors (FDP medial/lateral, FPL, Pronator Quadratus) + ALL Intrinsic Hand Muscles