Wrist/Hand

Question 1

Flexor carpi radialis (FCR)
-Action
-Root, trunk, cord, nerve

Answer 1

-Wrist flexion, radial deviation (abduction)
-C6-C7, upper and middle trunk, lateral cord, median N

Question 2

Flexor carpi ulnaris (FCU)
-Action
-Root, trunk, cord, nerve

Answer 2

-Wrist flexion, ulnar deviation (adduction)
-C8-T1, lower trunk, medial cord, ulnar N

Question 3

Palmaris Longus
-Action
-Root, trunk, cord, nerve

Answer 3

-Wrist flexion
-C7, C8, median N (likely middle/lower trunk, medial and lateral cord)

Question 4

Extensor carpi radialis longus (ECRL) and brevis (ECRB)
-Action
-Root, trunk, cord, nerve

Answer 4

-Wrist extension, radial deviation (abduction)
-C6-C7, upper and middle trunk, posterior cord, radial N

Question 5

Extensor carpi ulnaris (ECU)
-Action
-Root, trunk, cord, nerve

Answer 5

-Wrist extension, ulnar deviation (adduction)
-C7-C8, middle and lower trunk, posterior cord, radial n (PIN)

Question 6

Dorsal Compartments of wrist
1:
2:
3:
4:
5:
6:

Answer 6

1: APL, EPB (dequervian’s)
2: ECRL, ECRB
3: EPL
4: ED, EIP
5: EDM
6: ECU

Question 7

Dorsal interossei
-Action
-Root, trunk, cord, nerve

Answer 7

-Finger abduction (DAB)
-C8-T1, lower trunk, medial cord, ulnar n

Question 8

Palmar interossei
-Action
-Root, trunk, cord, nerve

Answer 8

-Finger adduction (PAD)
-C8-Tt1, lower trunk, medial cord, ulnar n

Question 9

Flexor digitorum superficialis (FDS)
-Action
-Root, trunk, cord, nerve

Answer 9

-Finger flexion (PIP), small wrist flexion
-C7-C8, middle and lower trunk, medial and lateral cord, median n

Question 10

Flexor digitorum profundus (FDP)
-Action
-Root, trunk, cord, nerve

Answer 10

-Finger flexion (DIP, PIP), small wrist flexion
-C7-T1, middle and lower trunk, medial cord, median n (AIN) for digits 2/3, ulnar n for digits 4/5

Question 11

Flexor pollicis brevis (FPB)
-Action
-Root, trunk, cord, nerve

Answer 11

-Thumb flexion
-C8-T1, lower trunk, medial cord, median AND ulnar N

Question 12

Flexor pollicis longus (FPL)
-Action
-Root, trunk, cord, nerve

Answer 12

-Thumb flexion, small wrist flexion
-C7-T1, middle and lower trunk, medial and lateral cord, median n (AIN)

Question 13

Extensor digitorum (ED) or Extensor digitorum communis (EDC)
-Action
-Root, trunk, cord, nerve

Answer 13

-Finger extension (2-5), small wrist extension
-C7-C8, middle and lower trunk, posterior cord, radial n (PIN)

Question 14

Extensor indicis proprius
-Action
-Root, trunk, cord, nerve

Answer 14

-Finger extension (2), small wrist extension
-C7-C8, middle and lower trunk, posterior cord, radial n (PIN)

Question 15

Extensor pollicis longus (EPL)
-Action
-Root, trunk, cord, nerve

Answer 15

-Thumb extension, small wrist extension
-C7-C8, middle and lower trunk, posterior cord, radial n (PIN)

Question 16

Extensor digiti minimi (EDM)
-Action
-Root, trunk, cord, nerve

Answer 16

-Finger extension (5), small wrist extension
-C7-C8, middle and lower trunk, posterior cord, radial n (PIN)