1. flexors
   1. zones
      1. Subtopic 1
      2. Zone 1 is distal to the insertion of the FDS tendon. A laceration in zone 1, by definition, injures only the tendon of the FDP
      3. zone 2, or “no man's land.: start from proximal aspect of the A1 pulley to FDS insertion
      4. Zone 3 denotes the origin of the lumbricals from the FDP tendon.
      5. zone 4 describes the flexor tendons within the carpal tunnel. Distal to the transverse carpal ligament at approximately the level of the superficial palmar vascular arch, the lumbrical tendons take their origin from the FDP tendons.
      6. Zone 5 extends from the muscle-tendon junction to the proximal aspect of the carpal tunnel,
   2. Subtopic 2
2. extensors
3. thumb
   1. EPL: hand flat on the table raise the thumb up=test Radial n.
   2. APB: Palmar abduction of thumb=prayr sign=median nerve
4. internal muscles
   1. interossei:middle finger over the index finger = Ulnar nerve