Posterior Forearm, Wrist And Hand Anatomy

Question 1

What type of joint is the radiocarpal joint?

Answer 1

Condylar synovial joint

Question 2

What movements can occur at the radiocarpal joint?

Answer 2

Flexion + Extension
Ulnar + radial deviation

Question 3

What type of joint is the Metacarpophalangeal joint and the Interphalangeal joints?

Answer 3

Hinge joints

Question 4

What is Abduction of the fingers?

What joint does it happen at?

Answer 4

Midline = middle of middle finger
Thumb and finger move in opposite directions away from the midline

Happens at Metacarpophalangeal joint

Question 5

What is Adduction of the fingers?

What joint does it happen at?

Answer 5

Midline = middle of middle finger
Thumb and finger move in same direction towards the midline

Happens at Metacarpophalangeal joint

Question 6

What special movement can happen at the fingers which uses a combination of movements?

Answer 6

Circumduction

Question 7

What nerve innervates the posterior forearm (whole posterior upper limb)?

Answer 7

Radial nerve

Question 8

What is the function of the posterior forearm muscles?

Answer 8

Extensors
(Supination)

Question 9

What are the 2 parts of the posterior compartment of the forearm?

Answer 9

Superficial
Deep

Question 10

What muscles are in the superficial layer of the posterior compartment of the forearm?

Answer 10

3 to wrist, 2 to hand and 2 to other in superficial layer:

Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris

Extensor digitorum communis
Extensor digiti minimi

Brachioradialis
Anconeus

Question 11

What is the origin and insertion of Brachioradialis?

Answer 11

Origin = lateral supracondylar ridge of humerus

Insertion = distal radius just proximal to Styloid process

Question 12

What is the common extensor origin?

Answer 12

Lateral epicondyle of humerus

Question 13

What is the function of Brachioradialis?

Answer 13

Flexes elbow

Question 14

What is the origin of Extensor Carpi Radialis Brevis?

What is the origin of Extensor Carpi Radialis Longus?

Answer 14

ECRB = Lateral epicondyle (common extensor origin)

ECRL = supracondylar ridge of humerus

Question 15

Where does Extensor Carpi Radialis Longus and Extensor Carpi Radialis Brevis insert?

Answer 15

Metacarpals II and III

Question 16

What is the function of ECRB and ECRL?

Answer 16

Extension of wrist
Abduction of wrist

Question 17

What is the origin and insertion of Extensor digitorum (communis)?

Answer 17

Origin = lateral epicondyle

Inserts = middle + distal phalanx II-V

Question 18

What is the function of extensors digitorum?

Answer 18

Extends fingers II, III IV and V at the Metacarpophalangeal joint and Interphalangeal joint

Question 19

What is the origin and insertion of Extensor digiti minimi?

Answer 19

Origin = lateral epicondyle

Inserts = attaches with extensor digitorum tendon and inserts into extensor hood of little finger

Question 20

Where does extensor digit minimi come from?

Answer 20

It originates/comes off of the extensor digitorum muscle

Question 21

What is the function of extensor digiti minimi?

Answer 21

Extends little finger
Wrist extension

Question 22

What is the origin and insertion of Extensor carpi ulnaris?

Answer 22

Origin = lateral epicondyle

Insertion = metacarpal V

Question 23

What is the function of Extensor carpi ulnaris?

Answer 23

Wrist extension
Wrist Adduction

Question 24

What is the origin and insertion of Anconeus?

Answer 24

Origin = Lateral epicondyle (humerus)

Insertion = Olecranon (lateral surface of Olecranon of ulnar)

Question 25

What is the function of Anconeus?

Answer 25

Extends + stabilises elbow joint Abducts ulna during forearm pronation

Question 26

What are all the muscles of the SUPERFICIAL posterior compartment of the forearm which originate at the common extensor origin/lateral epicondyle?

Answer 26

Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris Anconeus

Question 27

What are the muscles of the deep layer of the Posterior forearm?

Answer 27

Supinator Extensor indicis Extensor pollicis longus Extensor pollicis brevis Abductor pollicis longus

Question 28

What is the origin and insertion of the Supinator?

Answer 28

Origin = Lateral epicondyle + ulnar Insert = radius

Question 29

What is the function of Supinator?

Answer 29

Supination

Question 30

What is the origin and insertion of Abductor pollicis longus?

Answer 30

Origin = interosseous membrane Inserts = metacarpal 1

Question 31

What is the action of abductor pollicis longus?

Answer 31

Thumb abduction

Question 32

What is the origin and insertion of extensor pollicis longus?

Answer 32

Origin = ulnar Inserts = distal phalanx of thumb

Question 33

What is the action of extensor pollicis longus?

Answer 33

Extends all joints of thumb

Question 34

What is the origin and insertion extensor pollicis brevis?

Answer 34

Origin = radius Insertion = proximal phalanx of thumb

Question 35

What is the action of extensor pollicis brevis?

Answer 35

Extends thumb at Metacarpophalangeal joint and Carpometacarpal joint

Question 36

What is the origin and insertion of extensor indicis?

Answer 36

Origin = ulnar Insertion = extensor hood of index

Question 37

What is the action of extensor indicis?

Answer 37

Extends index finger

Question 38

What are the borders of the anatomical snuff box?

Answer 38

Remember LBL Extensor pollicis Longus (Border closest to digits) Extensor pollicis Brevis (Border closest to thumb) Abductor pollicis Longus (Border right next to extensor pollicis brevis)