21. Posterior Forearm and Dorsum of Hand

Question 1

Origin of anconeus?

Answer 1

Lateral epicondyle of humerus

Question 2

Insertion of anconeus?

Answer 2

Olecranon of ulna

Question 3

Function of anconeus?

Answer 3

Weak extensor of elbow

Question 4

Innervation of anconeus?

Answer 4

Radial nerve C7-C8

Question 5

Origin of brachioradialis?

Answer 5

Distal humerus (supra-epicondylar ridge)

Question 6

Insertion of brachioradialis?

Answer 6

Radius (proximal to styloid process)

Question 7

Function of brachioradialis?

Answer 7

Flexion of elbow (especially when forearm is semi-prone)

Question 8

Innervation of brachioradialis?

Answer 8

Radial nerve C5-C7

Question 9

Where is the common extensor origin?

Answer 9

Lateral epicondyle of the humerus

Question 10

Origin of extensor carpi radialis longus?

Answer 10

Distal humerus (supra-epicondylar ridge)

Question 11

Insertion of extensor carpi radialis longus?

Answer 11

Base of 2nd metacarpal

Question 12

Function of extensor carpi radialis longus?

Answer 12

Wrist extension and abduction

Question 13

Innervation of extensor carpi radialis longus?

Answer 13

Radial nerve C6, C7

Question 14

Origin of extensor carpi radialis brevis?

Answer 14

Lateral epicondyle of humerus

Question 15

Insertion of extensor carpi radialis brevis?

Answer 15

Base of 3rd metacarpal

Question 16

Function of extensor carpi radialis brevis?

Answer 16

Wrist extension and abduction

Question 17

Innervation of extensor carpi radialis brevis?

Answer 17

Posterior interosseous branch of radial nerve C7, C8

Question 18

Origin of extensor carpi ulnaris?

Answer 18

Lateral epicondyle of humerus

Question 19

Insertion of extensor carpi ulnaris?

Answer 19

Base of 5th metacarpal

Question 20

Function of extensor carpi ulnaris?

Answer 20

Wrist extension and adduction (when working with flexor carpi ulnaris)

Question 21

Innervation of extensor carpi ulnaris?

Answer 21

Posterior interosseous branch of radial C7, C8

Question 22

Origin of extensor digitorum?

Answer 22

Lateral epicondyle of humerus

Question 23

Insertion of extensor digitorum?

Answer 23

Dorsal expansion of digits 2-5

Question 24

Function of extensor digitorum?

Answer 24

Extension of MCP and IP of digits 2-5

Question 25

Innervation of extensor digitorum?

Answer 25

Posterior interosseous branch of radial nerve C7-C8

Question 26

Origin of extensor digiti minimi?

Answer 26

Lateral epicondyle of humerus

Question 27

Insertion of extensor digit minimi?

Answer 27

Dorsal expansion of 5th digit

Question 28

Function of extensor digit minimi?

Answer 28

Extension of MCP and IP joints of little finger

Question 29

Innervation of extensor digit minimi?

Answer 29

Posterior interosseous branch of radial nerve C7-C8

Question 30

Origin of extensor indices?

Answer 30

Posterior surface of ulna and interosseous membrane

Question 31

Insertion of extensor indices?

Answer 31

Dorsal expansion of digit 2

Question 32

Function of extensor indices?

Answer 32

Extension of MCP and IP at index finger | Also wrist flexion

Question 33

Innervation of extensor indices?

Answer 33

Posterior interosseous branch of radial nerve C7, C8

Question 34

Origin of extensor pollicis longus?

Answer 34

Ulna and interosseous membrane

Question 35

Insertion of extensor pollicis longus?

Answer 35

Base of distal phalanx of thumb

Question 36

Function of extensor pollicis longus?

Answer 36

CMC, MCP and IP extension of thumb | Extension of wrist

Question 37

Innervation of extensor pollicis longus?

Answer 37

Posterior interosseous branch of radial nerve C7, C8

Question 38

Origin of extensor pollicis brevis?

Answer 38

Radius and interossous membrane

Question 39

Insertion of extensor pollicis brevis?

Answer 39

Base of proximal phalanx of thumb

Question 40

Function of extensor pollicis brevis?

Answer 40

CMC and MCP thumb joint extension | Extension of wrist

Question 41

Innervation of extensor pollicis brevis?

Answer 41

Posterior interosseous branch of radial nerve C7, C8

Question 42

Origin of abductor pollicis longus?

Answer 42

Radius Interosseous membrane Ulna

Question 43

Insertion of abductor pollicis longus?

Answer 43

Base of 1st metacarpal

Question 44

Function of abductor pollicis longus?

Answer 44

Abducts thumb and extends it at the CMC joint | Extends wrist

Question 45

Innervation of abductor pollicis longus?

Answer 45

Posterior interosseous branch of radial nerve C7-C8

Question 46

Origin of supinator?

Answer 46

Crest of ulna Lateral epicondyle of humerus Radial collateral Annular ligament of radius

Question 47

Insertion of supinator?

Answer 47

Proximal 1/3rd of lateral radius

Question 48

Function of supinator?

Answer 48

Supination of forearm by 'rolling' the radius

Question 49

Innervation of supinator?

Answer 49

Posterior interosseous branch of radial nerve C7, C8

Question 50

Through the heads of which muscle does radial nerve pass?

Answer 50

Supinator

Question 51

Through the heads of which muscle does ulnar nerve pass?

Answer 51

Extensor carpi ulnaris

Question 52

Where does the brachial artery become the radial artery?

Answer 52

In cubital fossa

Question 53

What vein runs with the radial nerve?

Answer 53

Cephalic vein

Question 54

What muscles make up the anatomical snuffbox?

Answer 54

ABL Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus

Question 55

What is the dorsal expansion?

Answer 55

Strong connective tissue | Allows the long flexors and short muscles of the hand to act on all three finger joints