Wrist and Hand myology

Question 1

forearm pronation

Answer 1

 Pronator teres
 Pronator quadratus

Question 2

forearm supination

Answer 2

Biceps Brachii
Supinator

Question 3

Wrist Flexion

Answer 3

 Flexor carpi radialis (FCR)
 Flexor carpi ulnaris (FCU)
 Palmaris longus
 Flexor digitorum superficialis (FDS)

ROM:
 85 ̊

Question 4

Wrist Extension

Answer 4

 Extensor carpi radialis longus (ECRL)
 Extensor carpi radialis brevis (ECRB)
 Extensor carpi ulnaris (ECU)

ROM:
 85 ̊

Question 5

Radial Deviation

Answer 5

 Extensor carpi radialis longus
 Extensor carpi radialis brevis
 Extensor pollicis longus
 Extensor pollicis brevis
 Flexor carpi radialis
 Abductor polluicis longus

ROM:
 15 ̊

Question 6

Ulna Deviation

Answer 6

 Extensor carpi ulnaris
 Flexor carpi ulnaris

ROM:
 45 ̊

Question 7

movements of the hand

Answer 7

MOVEMENTS
OF THE HAND
 Digit flexion
 Digit extension
 Digit abduction
 Digit adduction

Question 8

Digit Flexion

Answer 8

 Flexor digitorum superficialis
 Flexor digitorum profundus

Question 9

Digit Extension

Answer 9

 Extensor digitorum
 Extensor indicis

Question 10

Thumb Movements

Answer 10

Flexion (A)
 Flexor pollicis longus
 Flexor pollicis brevis
 Adductor pollicis (assists)
 Palmer interossei (1st, assists)

Opposition (E)
 Opponens pollicis
 Flexor pollicis brevis (assists)
 Abductor pollicis brevis (assists)

Extension (B)
 Extensor pollicis longus
 Extensor pollicis brevis
 Abductor pollicis longus
 Palmar interossei (1st, assists)

Question 11

Anatomical Snuff Box

Answer 11

LATERAL BORDER
Abductor Pollicis Longus
 (most lateral) radial side
Extensor Pollicis Brevis
 (next to APL) radial side

MEDIAL BORDER
Extensor Pollicis Longus
 (most medial)

Question 12

THENAR AND HYPOTHENAR EMINENCES

Answer 12

Thenar= thumb side
Hypothenar= little finger

Question 13

Nerves into the hand

Answer 13

 Radial Nerve
 Median Nerve
 Ulnar Nerve

Question 14

PALPATION FROM
MEDIAL EPICONDYLE

Answer 14

Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor carpi ulnaris

Question 15

FLEXOR DIGITORUM SUPERFICIALIS

Answer 15

ORIGIN
 Humeral head: medial epicondyle and ulnar collateral ligament
 Ulnar head: medial aspect of coronoid process
 Radial head: proximal half of anterior shaft, distal to radial tuberosity

INSERTION
 Sides of middle phalanges 2-5 by four separate tendons

ACTION
 Flexes proximal interphalangeal joints 2-5
 Assists in flexing metacarpophalangeal joints 2-5
 Assists in flexing the wrist

All together as fist
Individually as in playing piano or darts

Question 16

FLEXOR DIGITORUM PROFUNDUS

Answer 16

ORIGIN
 Ulna, proximal three-quarters anterior and medial surfaces and interosseous membrane

INSERTION
 Bases of distal phalanges 2-5, palmar side by four separate tendons

ACTION
 Flexes distal interphalangeal joints 2-5
 Assists in flexing proximal interphalangeal joints 2-
5
 Assists in flexing metacarpophalangeal joints 2-5
 Assists in flexing the wrist

Thus allowing movement of finger
flexion at all joints
Unlike superficialis extends to distal phalanges

Rock climbing, gripping etc

Question 17

EXTENSOR DIGITORUM

Answer 17

ORIGIN
 Lateral epicondyle of humerus

INSERTION
 Middle and distal phalanges 2-5, dorsal side

ACTION
 Extends digits 2-5 at metacarpophalangeal,
proximal interphalangeal, and distal interphalangeal joints
 Extends the wrist
 Slightly extends the elbow

Question 18

EXTENSOR INDICIS

Answer 18

Origin:
 Posterior surface of the distal
shaft of ulna and interosseous
membrane

Insertion:
 Tendon of extensor digitorum

Action:
 2nd finger extension
 2nd finger adduction
Nerve innervation:
 Radial

Question 19

ABDUCTOR POLLICIS LONGUS

Answer 19

ORIGIN
 Ulna, radius, and interosseous membrane, middle one-third of posterior surface

INSERTION
 Base of first metacarpal, dorsal side

ACTION
 Abducts the first carpometacarpal joint
 Extends the first carpometacarpal joint
 Radially deviates (abducts) the wrist
 Slightly flexes the wrist

Lateral border of snuffbox
Pulls thumb away from palm of hand

Question 20

EXTENSOR POLLICIS BREVIS

Answer 20

ORIGIN
 Radius, distal one-third of posterior surface and interosseous membrane

INSERTION
 Base of 1st proximal phalange, dorsal side

ACTION
 Extends the thumb at the carpometacarpal and
metacarpophalangeal joints
 Abducts the thumb at the carpometacarpal joint
 Slightly radially deviates (abducts) the wrist

Question 21

EXTENSOR POLLICIS LONGUS

Answer 21

ORIGIN
 Ulna, middle one-third of posterior surface and interosseous membrane

INSERTION
 Base of 1st distal phalange, dorsal side

ACTION
 Extends the thumb at the carpometacarpal, metacarpophalangeal, and interphalangeal joints
 Slightly radially deviates (abducts) the wrist
 Slightly extends the wrist

Most medial to EPB
Helps to move wrist towards thumb
Release objects

Question 22

FLEXOR POLLICIS LONGUS - THUMB

Answer 22

ORIGIN
 Radius, anterior surface of body and interosseous membrane

INSERTION
 Base of first distal phalange, palmar side

ACTION
 Flexes the thumb at carpometacarpal,
metacarpophalangeal, and intercarpal joints
 Assists in flexing the wrist

Helps with grip of all
joints