Upper Limb Compartments

Upper Limb Compartments

1. Arm

   • Anterior
     • Flexors
       • Biceps Brachii
         • Main supinator
         • Most efficient when elbow flexed and supinated
       • Brachialis
         • "work horse" ; Main flexor
         • Lateral parts: radial nerve
         • Not affected by supination or pronation
       • Coracobrachialis
         • Helps: Flexion & Adduction
         • Stabilizer
         • Superior to Brachial A. & Median N.
       • Musculocutaneous Nerve
         • Brachial plexus roots: C5-C7
   • Posterior
     • Extensors
       • Triceps Brachii
         • Long Head
           • resists dislocation
         • Lateral Head
           • primarily against resistance
         • Medial Head
           • "work horse"
       • Anconeus
         • Stabilizes elbow
       • Radial Nerve
         • Bachial Plexus roots: C5-T1

2. Forearm

   • Anterior
     • Flexors
       • Median Nerve
         • Brachial Plexus roots: C5-T1
       • Carpal Tunnels
         • FDP
         • FPL
         • Median N
         • FDS
   • Posterior
     • Brachioradialis
       • Flexors
       • most useful during neutral wrist
       • *Exception to rules of ant. compartment for flexors and nerve innervation
     • Extensors
       • Radial Nerve
         • Brachial Plexus roots: C5-T1
         • Brachioradialis
       • Extensor Tunnels
         • 1. APL, EPB
         • 2. ECRL, ECRB
         • 3. EPL
         • 4. EI, ED
         • 5. EDM
         • 6. ECU

3. Hand

   • Hypothenar
     • Digiti: AFO
       • Deep branch: Ulnar N.
   • Thenar
     • Pollicis: AFO
       • Recurrent Median N.
       • Deep head of F: Deep Ulnar
   • Extensor Tunnels
     • 1. APL, EPB
     • 2. ECRL, ECRB
     • 3. EPL
     • 4. EI, ED
     • 5. EDM
     • 6. ECU