Synergists of the Wrist

Question 1

Wrist Flexion

Answer 1

1. Flexor carpi radialis (primary)
   
   2. Flexor carpi ulnaris (PRIMARY)
   3. Palmaris longus (primary)
      a. Absent in about 10% of people
   4. Flexor digitorum superficialis (secondary)
   5. Flexor digitorum profundus (assists)*
   6. Flexor pollicis longus (assists)*

Question 2

Wrist Extension

Answer 2

1. Extensor carpi radialis longus (PRIMARY)
   a. Has the long lever
   
   2. Extensor carpi radialis brevis (PRIMARY)
      a. Has the power force
   3. Extensor carpi ulnaris
   4. Extensor digitorum (assists)
      a. Can be a substitution for wrist extension if the primary movers are not working properly
   5. Extensor indicis (assists)

Question 3

Wrist Abduction (Radial Deviation)

Answer 3

1. Extensor carpi radialis longus (PRIMARY)
   
   2. Extensor carpi radialis brevis
   3. Extensor pollicis longus
   4. Extensor pollicis brevis
   5. Flexor carpi radialis
   6. Abductor pollicis longus

Question 4

Wrist Adduction (Ulnar Deviation)

Answer 4

1. Extensor carpi ulnaris

2. Flexor carpi ulnaris