Elbow and Forearm

Question 1

what is the proximal origin of the brachioradialis?

Answer 1

lateral supracondylar ridge of humerus (above carpi radialis longus)

Question 2

what is the distal insertion of the brachioradialis?

Answer 2

lateral side of distal end of radius

Question 3

what is the action of the brachioradialis?

Answer 3

weak flexion of forearm, when forearm is midpronated

Question 4

what is the proximal origin of the extensor carpi radials longus?

Answer 4

lateral supracondylar ridge of humerus ( above the carpi radialis brevis)

Question 5

what is the distal insertion of the extensor carpi radialis longus?

Answer 5

base of 2nd metacarpal and 3rd metacarpal

Question 6

what muscles are innervated by the radial nerve?

Answer 6

• brachioradialis
• extensor carpi radialis longus and brevis
• extensor digiti minimi
• extensor carpi ulnaris
• extensor indicis
• anconeus
• supinator
• abductor pollicis longus
• extensor pollicis brevis and longus

Question 7

what is the proximal origin of the extensor carpi radialis brevis?

Answer 7

lateral epicondyle of humerus (underneath the brachioradialis and carpi radialis longus)

Question 8

what is the distal insertion of the extensor carpi radialis brevis?

Answer 8

base of 3rd metacarpal

Question 9

what is the proximal origin of the extensor digitorum and digits minimi?

Answer 9

lateral epicondyle of humerus

Question 10

what is the distal insertion of the extensor digitorum?

Answer 10

extensor expansions of the medial four digits

Question 11

what is the innervation of the extensor digitorum?

Answer 11

posterior interosseous nerve

Question 12

what is the action of the extensor digitorum?

Answer 12

extends 4 digits, assists in wrist in extension

Question 13

what is the distal insertion of the extensor digiti minimi?

Answer 13

extensor expansion of 5th digit

action: extends 5th digit

Question 14

what muscles have the action of extending, abducting hand at wrist?

Answer 14

• extensor carpi radialis longus

- extensor carpi radialis brevis

Question 15

what is the proximal origin of the extensor carpi ulnaris?

Answer 15

lateral epicondyle of humerus and posterior border of ulna

Question 16

what is the distal insertion of the extensor carpi ulnaris?

Answer 16

base of 5th metacarpal

Question 17

what is the proximal origin of the anconeus?

Answer 17

posterior surface of lateral epicondyle of humerus

Question 18

what is the distal insertion of the anconeus?

Answer 18

lateral surface of olecranon and posterior proximal ulna

Question 19

what is the action of the anconeus?

Answer 19

assists triceps in extending elbow; abducts ulna during pronation

Question 20

what is the proximal origin of the supinator?

Answer 20

lateral epicondyle of humerus, supinator crest of ulna

Question 21

what is the distal insertion of the supinator?

Answer 21

lateral, posterior, and anterior surfaces of radius

Question 22

what is the action of the supinator?

Answer 22

supinates forearm

Question 23

what is the proximal origin of the abductor pollicis longus?

Answer 23

posterior surface of ulna, radius, interosseous membrane

Question 24

what is the distal insertion of the abductor pollicis longus?

Answer 24

base of 1st metacarpal

Question 25

what is the action of the abductor policies longus?

Answer 25

abducts, extends thumb at carpometacarpal joint

Question 26

what is the proximal origin of the extensor pollicis brevis?

Answer 26

posterior surface of radius and interosseous membrane

Question 27

what is the distal insertion of the the extensor pollicis brevis?

Answer 27

base of proximal phalanx of thumb

Question 28

what is the action of the extensor pollicis brevis?

Answer 28

extends proximal phalanx thumb at carpometacarpal joint

Question 29

what is the proximal origin of the extensor pollicis longus?

Answer 29

posterior surface of ulna, interosseous membrane

Question 30

what is the distal insertion of the the extensor pollicis longus?

Answer 30

base of distal phalanx of thumb

Question 31

what is the action of the extensor pollicis longus?

Answer 31

extends distal phalanx thumb at interphalangeal and carpometacarpal joint

Question 32

what is the proximal origin of the extensor indicis?

Answer 32

posterior surface of ulna, interosseous membrane

Question 33

what is the distal insertion of the extensor indicis?

Answer 33

extensor expansion of 2nd digit

Question 34

what is the action of the extensor indicis?

Answer 34

extend 2nd digit and helps extend hand at wrist

Question 35

what is the proximal origin of the flexor digitorum profundus?

Answer 35

medial and anterior surface of ulna and interosseous membrane

Question 36

what is the distal insertion of the flexor digitorum profundus?

Answer 36

palmer base of distal phalangeal bones of medial four digits

Question 37

what is the action of the flexor digitorum profundus?

Answer 37

flexes distal phalangeal bones of the four medial digits; assists in flexion of hand at wrist

Question 38

what is the innervation of the flexor digitorum profundus?

Answer 38

(medial part) ulnar nerve (lateral part) medial nerve

Question 39

what is the proximal origin of the flexor pollicis longus?

Answer 39

anterior surface of radius and interosseous membrane

Question 40

what is the distal insertion of the flexor pollicis longus?

Answer 40

palmer base of distal phalanx of thumb

Question 41

what is the action of the flexor pollicis longus?

Answer 41

flexes bones of thumb

Question 42

what is the proximal origin of the pronator quadratus?

Answer 42

distal fourth of anterior ulna

Question 43

what is the distal insertion of the pronator quadratus?

Answer 43

distal fourth of anterior radius

Question 44

what is the action of the pronator quadratus?

Answer 44

pronates forearm

Question 45

what muscles are innervated by the median nerve?

Answer 45

- flexor pollicis longus - pronator quadratus - pronator teres - flexor carpi radialis - palmaris longus - flexor digitorum superficialis

Question 46

what is the proximal origin of the pronator teres?

Answer 46

(2 heads) | medial epicondyle of humerus and proximal surface of ulna

Question 47

what is the distal insertion of the pronator teres muscle?

Answer 47

midway along lateral surface of radius

Question 48

what is the action of the pronator teres muscle?

Answer 48

- pronates forearm | - assists w/ elbow flexion

Question 49

what is the proximal origin of the flexor carpi radialis and palmaris longus?

Answer 49

medial epicondyle of humerus

Question 50

what is the distal insertion of the flexor carpi radialis?

Answer 50

base 2nd metacarpal

Question 51

what is the action of the flexor carpi radialis and flexor carpi ulnaris?

Answer 51

flexes + abducts hand at wrist

Question 52

what is the distal insertion of the palmaris longus?

Answer 52

palmar aponeurosis

Question 53

what is the action of the palmaris longus?

Answer 53

flexes hand + tenses palmar aponeurosis

Question 54

what is the proximal origin of the flexor carpi ulnaris?

Answer 54

humeral head: medial epicondyle of humerus | ulnar head: olecranon and posterior border of ulna

Question 55

what is the distal insertion of the flexor carpi ulnaris?

Answer 55

pisiform bone, hook of hamate bone, base of 5th metacarpal

Question 56

what is the innervation of the flexor carpi ulnaris?

Answer 56

ulnar nerve

Question 57

what is the proximal origin of the flexor digitorum superficialis?

Answer 57

humero-ulnar head: medial epicondyle of humerus and coronoid process of ulna radial head: superior half of anterior radius

Question 58

what is the distal insertion of the flexor digitorum superficialis?

Answer 58

bodies of middle phalangeal bones of medial 4 digits

Question 59

what is the action of the flexor digitorum superficialis?

Answer 59

flexes middle and proximal phalangeal bones of medial 4 digits; also flexes hand at wrist

Question 60

what is the action of the extensor carpi ulnaris?

Answer 60

extends and adducts hand at wrist