Finger and Wrist Muscles

Question 1

flexor carpi radialis

Answer 1

o: common flexor tendon on medial humeral epicondyle
i: base of 2nd and 3rd metacarpals
in: median nerve
action: radial deviation, wrist flexion
position: sitting

Question 2

flexor carpi ulnaris

Answer 2

o: CFT on medial epicondyle
i: pisiform, hamate, base of 5th metacarpal
in: ulnar nerve
action: ulnar deviation, wrist flexion
position: sitting

Question 3

palmaris longus

Answer 3

o: CFT on medial humeral epicondyle
i: palmar aponeurosis on flexor retinaculum
in: median nerve
action: wrist flexion
position: sitting

Question 4

flexor digitorum superficialis

Answer 4

o: CFT on medial humeral epicondyle, anterior ulna and radius
i: middle phalanxes of 2nd to 5th fingers
in: median nerve
action: flex the 4 fingers, wrist flexion
position: sitting

Question 5

flexor digitorum profundus

Answer 5

o: medial and anterior ulna
i: distal phalanxes of 2nd to 5th fingers
in: median and ulnar nerve
action: flex 2nd to 5th fingers, wrist flexion
position: sitting

Question 6

flexor pollicis longus

Answer 6

o: distal one-third of radius
i: distal phalanx of the 1st finger
in: median nerve
action: thumb flexion
position: sitting

Question 7

extensor carpi radialis longus

Answer 7

o: lateral supracondylar ridge
i: base of 2nd metacarpal
in: radial nerve
action: wrist extension. radial deviation
position: sitting

Question 8

extensor carpi radialis brevis

Answer 8

o: CET on lateral humeral epicondyle
i: base of 3rd metacarpal
in: radial nerve
action: wrist extension, radial deviation
position: sitting

Question 9

extensor carpi ulnaris

Answer 9

o: CET, lateral humeral epicondyle
i: base of 5th metacarpal
in: radial nerve
action: extends the wrist, ulnar deviation
position: sitting

Question 10

extensor digitorum

Answer 10

o: CET on lateral humeral epicondyle
i: distal 2nd to 5th phalanges
in: radial nerve
action: extends digits, wrist extensor
position: sitting

Question 11

extensor digiti minimi

Answer 11

o: CET on lateral humeral epicondyle
i: extensor hood of 5th finger
in: radial nerve
action: extends the 5th finger
position: sitting

Question 12

extensor indicis

Answer 12

o: distal one-third of posterior ulna
i: distal phalanx of 1st finger
in: radial nerve
action: extend the index finger
position: sitting

Question 13

extensor pollicis longus

Answer 13

o: posterior lateral surface of middle ulna
i: distal phalanx of thumb
in: radial nerve
action: extends the thumb
position: sitting

Question 14

extensor pollicis brevis

Answer 14

o: posterior lower middle radius
i: proximal phalanx of thumb
in: radial nerve
action: extends thumb
position: sitting

Question 15

abductor pollicis longus

Answer 15

o: posterior radius, ulna midshaft
i: base of 1st metacarpal
in: radial nerve
action: abducts the thumb
position: in sitting