Muscle             Abbr              Action                         Nerve          Root
Supraspinatus           SS      Ex...
Extensor pollicis        EPL       Extension of IP joint of thumb   Posterior interosseous   C7 8
longus                  ...
2nd      2nd DIO   Abducts middle finger radially Ulnar   T1

3rd      3rd DIO   Abducts middle finger         Ulnar    T1...
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Muscle Anatomy of the Arm

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Arm Muscle Anatomy

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Muscle Anatomy of the Arm

  1. 1. Muscle Abbr Action Nerve Root Supraspinatus SS External rotation of arm Fixes Suprascapular C5 (6) shoulder during loading Infraspinatus IS External rotation of arm Suprascapular C5 (6) Teres major TMa Internal rotation of arm Lower subscapular C6 (7) Adduction Extension Pectoralis major PM Internal rotation of arm Lateral pectoral Medial C5 6 pectoral C7 8 Latissimus dorsi LD Adduction of arm Arises from cord C6 7 8 Deltoid D Abduction of arm Axillary C5 (6) Serratus anterior SA Forward rotation of scapula Arises directly from C5 6 7 (absence produces “winging”) roots Biceps BB Flexion of elbow Supination of Musculocutaneous C5 (6) forearm (flexed) Triceps T Extension of elbow Radial C(6) 7 Brachioradialis BR Flexion of elbow Radial C6 Pronator teres PT Pronation of forearm Median C6 7 (extended) Pronator quadratus PQ Pronation of forearm (flexed) Ant.interosseous C7 (median) Supinator S Supination of forearm Post.interosseous C6 (extended) (radial) Flexor carpi radialis FCR Flexion of wrist Median C6 7
  2. 2. Extensor pollicis EPL Extension of IP joint of thumb Posterior interosseous C7 8 longus (with AP and APB) (radial) Extensor pollicis EPB Extension of MP joint of Posterior interosseous C7 8 brevis thumb Abductor pollicis APL Extension of CM joint of Posterior interosseous C7 8 longus thumb Radial deviation of wrist Extensor digitorum ED Extension of MP joints Posterior interosseous C7 (8) Extensor indicis EI Extension of index Posterior interosseous C7 8 Extensor digiti minimi EDM Extension of small Posterior interosseous C7 8 Extensor carpi ulnaris ECU Extension of wrist Posterior interosseous C7 (8) Ulnar deviation of wrist Extensor carpi radialis ECRL Extension of wrist Radial C6 7 longus and brevis Radial deviation of wrist ECRB Flexor carpi ulnaris FCU Flexion of wrist Ulnar Ulnar C8 deviation of wrist Palmaris longus PL - Median C8 Flexor digitorum FDS Flexion of PIP joints Median C7 8 superficialis Flexor digitorum FDP Flexion of DIP joints Ant.intersseous (index C8 profundus and middle) Ulnar (ring and small) C8 Flexor pollicis longus FPL Flexion of thumb IP joint Ant.interosseous C8 Flexor pollicis brevis FPB Flexion of MP joint of thumb Median (superficial T1 head) Ulnar (deep head) Abductor pollicis APB Abduction of thumb (extension Median T1 brevis of IP joint) Adductor pollicis AP Adduction of thumb (extension Ulnar T1 of IP joint) Abductor digiti ADM Abduction of small finger Ulnar T1 minimi Flexor digiti minimi FDM Flexion of MP joint of small Ulnar T1 finger Interosseous Line of reference is axis of middle finger Dorsal Dorsal ABduct “DAB” 1st 1st DIO Abducts index finger Ulnar T1
  3. 3. 2nd 2nd DIO Abducts middle finger radially Ulnar T1 3rd 3rd DIO Abducts middle finger Ulnar T1 ulnarwards 4th 4th DIO Abducts ring finger Ulnar T1 Palmar Palmar ADduct “PAD” 1st 1st PIO Adducts index finger Ulnar T1 2nd 2nd PIO Adducts ring finger Ulnar T1 3rd 3rd PIO Adducts small finger Ulnar T1

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