Forearm essentials

Question 1

Total number of muscles in forearm

Answer 1

20

Question 2

Total number of muscles in extensor/ posterior compartment

Answer 2

12

6/6

Question 3

Name in order the six superficial extensor muscles

Answer 3

Brachioradialis
Extensor carpi radialis longus
Extensor carpo radialis brevis
Extensor digitorum (put up all four fingers, number four)
Extensor digiti minimi (number five, fifth finger)
Extensor carpi ulnaris

Question 4

Name in order the six deep extensor compartment muscles (as they run down the arm)

Answer 4

Anconeus (extension of the forearm)
Supinator (opposite to pronator teres)
Snuff box - 'brevis sandwich' (order bottom to top)
          - abductor pollicis longus
          - extensor pollicis brevis
          - extensor pollicis longus
Extensor Indicis

Question 5

Total number of muscles in flexor/ posterior compartment

Answer 5

8
4 - superficial
1 - middle
3 - deep

Question 6

Name in order (PFPF) the four superficial anterior/ flexor compartment muscles

Answer 6

Pronator teres
Flexor carpi radialis
Palmaris longus (only tendon that doesn’t go through the carpal tunnel)
Flexor carpi ulnaris (ulnar nerve)

Question 7

Name the deep (and middle) muscles (4 - 3:1) of the anterior/ flexor compartment

Answer 7

middle - Flexor digitorum superficialis (only goes to middle phalanges)
Flexor digitorum profundus (goes to tips of fingers) NB. some ulnar nerve innervation.
Flexor pollicis longus (goes to the tip of the thumb)
Pronator Quadratus