muscles of the arm and posterior forearm

Question 1

biceps brachii origin

Answer 1

short head: coracoid process of the scapula

long head: supraglenoid tubercle of the scapula

Question 2

biceps brachii insertion

Answer 2

both the short and long head: tuberosity of the radius

Question 3

biceps brachii innervation

Answer 3

musculocutaneous nerve (C5,C6)

Question 4

biceps brachii action

Answer 4

supinates the forearm, flexes the elbow, flexes the shoulder joint

the short head helps to resist dislocation of shoulder

Question 5

brachialis origin

Answer 5

distal hald of the anterior surface of the humerus

Question 6

brachialis insertion

Answer 6

coronoid process and tuberosity of the ulna

Question 7

brachialis innervaton

Answer 7

Musculocutaneous nerve

Question 8

brachialis action

Answer 8

flexes elbow joint in all positions

Question 9

coracobrachialis origin

Answer 9

coracoid process of the scapula

Question 10

coracobrachialis insertion

Answer 10

middle third of medial surface of humerus

Question 11

coracobrachialis innervation

Answer 11

musculocutaneous nerve

Question 12

coracobrachialis action

Answer 12

helps flex and adduct should joint, resisits disloction of the shoulder

Question 13

triceps origin of the long head

Answer 13

infreglenoid tubercule of the scapula

Question 14

triceps origin of the lateral head

Answer 14

posterior surface of the humerus, superior to radial groove

Question 15

triceps origin of the medial head

Answer 15

posterior surface of humerus inferior to the radial groove

Question 16

triceps insertion (all three)

Answer 16

olecranon of the ulna and fasica of the forearm

Question 17

triceps innervation (all three)

Answer 17

radial nerve

Question 18

triceps action (all three)

Answer 18

• main extensor of the elbow joint

- long head extends shoulder joint and resists dislocation

Question 19

anconeus origin

Answer 19

lateral epicondyle of humerus

Question 20

anconeus insertion

Answer 20

lateral surface of the olcranon and superior part of posterior surface of the ulna

Question 21

anconeus innervation

Answer 21

radial nerve

Question 22

anconeus action

Answer 22

assiss triceps in extending the elbow
stablizes the elbow joint
adducts ulna during pronation

Question 23

Branchioradialis origin

Answer 23

lateral supracondylar ridge of the humerus

Question 24

Brachioradialis insertion

Answer 24

lateral suraface of distal end of radius proximal to the styloid process

Question 25

brachioradialis innervation

Answer 25

radial nerve

Question 26

brachioradials action

Answer 26

weak flexion of the elbow, maximal when forearm is in midpronated position

Question 27

extensor carpi radialis longus origin

Answer 27

lateral supra-epicondylar ridge of humerus

Question 28

extensor carpi radialis longus insertion

Answer 28

dorsal aspect of base of 2nd metacarpal

Question 29

extensor carpi radialis longus innervation

Answer 29

radial nerve

Question 30

extensor carpi radialis longus action

Answer 30

extend and abduct wrist joint | active during fist clenching

Question 31

extensor carpi radialis brevis origin

Answer 31

lateral epicondyle of the humerus

Question 32

extensor carpi radialis brevis insertion

Answer 32

dorsal aspect of base of 3rd metacarpal

Question 33

extensor carpi radialis brevis innervtion

Answer 33

deep branch of the radial nerve

Question 34

extensor carpi brevis action

Answer 34

- same as the extensor carpi radialis longus - extends and abduct wrist joint - active during fist clenching

Question 35

extensor digitorum origin

Answer 35

lateral epicondyle of the humerus

Question 36

extensor digitorum insertion

Answer 36

extensor expansion of medial four fingers

Question 37

extensor digitorum innervation

Answer 37

deep branch of the radial nerve

Question 38

extensor digitorum action

Answer 38

- extends wrist | - extends medial four fingers at the metacarpophalangeal joint then at interphalangeal joints

Question 39

extensor digiti minimi origin

Answer 39

lateral epicondyle of the humerus

Question 40

extensor digiti minimi insertion

Answer 40

adducts and extensor expansion of 5th finger

Question 41

extensor digiti minimi innervation

Answer 41

posterior interosseous nerve,

Question 42

extensor digiti minimi action

Answer 42

extends wrist joint | extends 5th finger mostly at the metacarophalangeal

Question 43

extensor carpi ulnaris origin

Answer 43

lateral epicondyle of the humerus

Question 44

extensor carpi ulnaris insertion

Answer 44

dorsal aspect of base of 5th metacarpal

Question 45

extensor carpi ulnaris innervation

Answer 45

posterior interosseous nerve

Question 46

extensor carpi ulnaris action

Answer 46

extends and adducts wrist joint

Question 47

adductor pollicus longus origin

Answer 47

- outcropping muscle of the forearm | - posterior surface of proximal halves of ulna, radius, and interosseous membrane

Question 48

adductor pollicus longus insertion

Answer 48

base of 1st metacarpal

Question 49

adductor pollicus longus innervation

Answer 49

posterior interosseous nerve

Question 50

adductor pollicus longus action

Answer 50

extends wrist joint | abduct thumb and extends it at carpometacarpal joint

Question 51

extensor pollicis longus origin

Answer 51

posterior surface of middle third of ulna and interosseous membrane

Question 52

extensor pollicis longus insertion

Answer 52

dorsal aspect of base of distal plalanx of thumb

Question 53

extensor pollicis longus innervation

Answer 53

posterior interosseous nerve

Question 54

extensor pollicis longus action

Answer 54

extends wrist joint extends phalanx of thumb at interphalangeal joint extends metacarpophalangeal and carpometacarpal joint

Question 55

extensor pollicis brevis origin

Answer 55

posterior surface of distal third of radius and interosseous membrane

Question 56

extensor pollicis brevis insertion

Answer 56

dorsal aspect of base of proximal phalanx of thumb

Question 57

extensor pollicis brevis innervation

Answer 57

posterior interosseous nerve

Question 58

extensor pollicis brevis action

Answer 58

- extends wrist joint | - extends proximal phalanx thumb at metacarpophalageal pharynx

Question 59

extensor indicis origin

Answer 59

posterior surface of distal third of ulna and interosseous membrane

Question 60

extensor indicis insertion

Answer 60

extensor expansion of 2nd finger

Question 61

extensor indicis innervation

Answer 61

posterior interosseous nerve

Question 62

extensor indicis action

Answer 62

- extends wrist at joint | - extends 2nd finger, helps extend hand at wrist

Question 63

Supinator origin

Answer 63

Lateral epicondyle of humerus

Question 64

Supinator insertion

Answer 64

Lateral, posterior, and anterior surfaces of proximal third of the radius

Question 65

Supinator innervation

Answer 65

Deep branch of radial nerve

Question 66

Supinator action

Answer 66

Supinates forearm