RT Book, Section A1 Cooney, Robert A2 Cydulka, Rita K. A2 Fitch, Michael T. A2 Joing, Scott A. A2 Wang, Vincent J. A2 Cline, David M. A2 Ma, O. John SR Print(0) ID 1143144715 T1 Hand and Wrist Injuries T2 Tintinalli's Emergency Medicine Manual, 8e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9780071837026 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1143144715 RD 2024/04/19 AB The hand is innervated by the median, ulnar, and radial nerves. Motor function of the median nerve can be screened by flexing the thumb distal phalanx against resistance, the ulnar nerve by spreading the fingers against resistance, and the radial nerve by maintaining extension of the finger MCP joints against resistance. Sensory innervation (Fig. 170-1) is best screened by the presence of normal two-point discrimination (<5 mm). Injuries requiring hand surgery consultation are listed in Tables 170-1 and 170-2.