Hand myology

Question 1

Flexor Carpi radialis

Answer 1

*Origin- medial epicondyle of humerus via common flexor tendon.
*Insertion- palmar surface bases of 2nd+3rd metacarpal.
*Action- flexion
-Synergist: radial deviation
*Nerve- median nerve C6,7

Question 2

Flexor Carpi ulnaris

Answer 2

*Origin- medial epicondyle of humerus via common flexor tendon, upper 2/3rds posterior ulna
*Insertion- pisiform (hook of hamate, 5th metacarpal)
*Action- Flexion
-Synergist: ulnar deviation
*Nerve- ulnar nerve C7,8

Question 3

Flexor Digitorum Superficialis

Answer 3

*Origin- Medial epicondyle humerus, ulnar collateral ligament, coronoid process of ulna and shaft of radius.
*Insertion- palmar surface base of middle phalanx of finger 2-5
*Action- Flexes PIP jts
*Nerve- median nerve C7,8 T1

Question 4

Flexor Digitorum Profundus

Answer 4

*Origin- upper 3/4 medial and anterior surface of ulna & middle 1/3 anterior interosseous membrane
*Insertion- palmar surface base distal phalanx 2-5
*Action- Flexes DIP joints
*Nerve- anterior interosseous branch median nerve C7, C8, T1 (index and middle finger)
-ulnar nerve C8, T1 (little and ring fingers)

Question 5

Palmaris Longus

Answer 5

*Origin- medial epicondyle (flexor tendon)
*Insertion- flexor retinaculum
*Action- weak wrist flexor
*Nerve- median nerve C8

lies between Flexor Carpi radialis + Flexor Carpi ulnaris

Question 6

Extensor Carpi Radialis Longus

Answer 6

*Origin- lower 1/3rd lateral supracondylar ridge of humerus
*Insertion- (posterior) base 2nd metacarpal
*Action- extends wrist
-Synergist: radial deviation
*Nerve- radial nerve C6,C7

Question 7

Extensor Carpi Radialis Brevis

Answer 7

*Origin- Lateral Epicondyle of humerus via common extensor tendon
*Insertion- (posterior) base 3rd metacarpal
*Action- extends wrist
-Synergist: radial deviation
*Nerve- posterior interosseous branch of radial nerve C6,7

Question 8

Extensor Carpi Ulnaris

Answer 8

*Origin- Lateral epicondyle of humerus via common extensor tendon.
*Insertion- (medial) base of 5th metacarpal
*Action- wrist extension
-Synergist: ulna deviation
*Nerve- Radial nerve C6, 7, 8

Question 9

Extensor Digitorum

Answer 9

*Origin- Lateral epicondyle humerus via common extensor tendon
*Insertion- posterior bases 2-5 middle and distal phalanges
*Action- extends fingers and wrist
*Nerve- posterior interosseous branch of radial nerve C7,8