Posterior Forearm

Question 1

Triceps brachii origin (long head)

Answer 1

Infraglenoid tubercle

Question 2

Triceps brachii origin (medial head)

Answer 2

Posterior humerus medial to radial groove

Question 3

Triceps brachii origin (lateral head)

Answer 3

Posterior humerus lateral to radial groove

Question 4

Triceps brachii insertion

Answer 4

Proximal olecranon

Question 5

Triceps brachii action (all heads)

Answer 5

Elbow extension

Question 6

Triceps brachii action (long head)

Answer 6

Least active head
Weak adductor and extensor of the shoulder
Helps to resist glenohumeral dislocation

Question 7

Triceps brachii action (lateral head)

Answer 7

Strongest head
Primarily active against resistance (elbow extension)

Question 8

Triceps brachii action (medial head)

Answer 8

Always active
Elbow extension

Question 9

Anconeus origin

Answer 9

Lateral epicondyle

Question 10

Anconeus insertion

Answer 10

Lateral olecranon and posterior ulna

Question 11

Anconeus actions

Answer 11

Assist in extension, elbow stabilization

Question 12

Triceps brachii innervation

Answer 12

Radial nerve

Question 13

Anconeus innervation

Answer 13

Radial nerve

Question 14

Lateral border of the quadrangular space

Answer 14

Surgical neck of humerus

Question 15

Medial border of the quadrangular space

Answer 15

Long head of triceps brachii

Question 16

Superior border of the quadrangular space

Answer 16

Teres minor

Question 17

Inferior border of the quadrangular space

Answer 17

Teres major

Question 18

Contents of the quadrangular space

Answer 18

Axillary nerve and posterior circumflex humeral artery

Question 19

Lateral border of the triangular space

Answer 19

Long head of triceps brachii

Question 20

Superior border of the triangular space

Answer 20

Teres minor

Question 21

Inferior border of the triangular space

Answer 21

Teres major

Question 22

Lateral border of the triangular interval

Answer 22

Humeral shaft

Question 23

Medial border of the triangular interval

Answer 23

Long head of triceps brachii

Question 24

Superior border of the triangular interval

Answer 24

Teres major

Question 25

Contents of the triangular space

Answer 25

Circumflex scapular artery

Question 26

Contents of the triangular interval

Answer 26

Radial nerve and the profundus brachii artery

Question 27

Origin of brachioradialis

Answer 27

Lateral supracondylar ridge

Question 28

Insertion of brachioradialis

Answer 28

Styloid process of radius

Question 29

Innervation of brachioradialis

Answer 29

Radial nerve

Question 30

Action of brachioradialis

Answer 30

Elbow flexion

Question 31

Extensor carpi radialis longus origin

Answer 31

Lateral supracondylar ridge

Question 32

Extensor carpi radialis longus insertion

Answer 32

Base of MCII

Question 33

Extensor carpi radialis longus innervation

Answer 33

Radial nerve

Question 34

Extensor carpi radialis longus action

Answer 34

Wrist extension and abduction

Question 35

Extensor carpi radialis brevis origin

Answer 35

Lateral epicondyle

Question 36

Extensor carpi radialis brevis insertion

Answer 36

Base of MC III

Question 37

Extensor carpi radialis brevis innervation

Answer 37

Deep branch of radial

Question 38

Extensor carpi radialis brevis action

Answer 38

Extension and abduction of the wrist

Question 39

Extensor carpi ulnaris origin

Answer 39

Lateral epicondyle and posterior ulna

Question 40

Extensor carpi ulnaris insertion

Answer 40

Base of MC V

Question 41

Extensor carpi ulnaris innervation

Answer 41

Deep branch of radial

Question 42

Extensor carpi ulnaris action

Answer 42

Extension and adduction of the wrist

Question 43

Extensor digitorum origin

Answer 43

Lateral epicondyle

Question 44

Extensor digitorum insertion

Answer 44

Extensor expansions of digits 2-5

Question 45

Extensor digitorum innervation

Answer 45

Deep branch of radial

Question 46

Extensor digitorum action

Answer 46

Extension of MCP joints of digits 2-5

Question 47

Extensor digiti minimi origin

Answer 47

Lateral epicondyle

Question 48

Extensor digiti minimi insertion

Answer 48

Extensor expansion of digit 5

Question 49

Extensor digiti minimi innervation

Answer 49

Deep branch of radial

Question 50

Extensor digiti minimi action

Answer 50

Extension of MCP joint of digit 5

Question 51

Supinator origin

Answer 51

Lateral epicondyle, posterior ulna

Question 52

Supinator insertion

Answer 52

Proximal 1/3 of radius

Question 53

Supinator innervation

Answer 53

Deep branch of radial

Question 54

Supinator action

Answer 54

Supination

Question 55

Abductor pollicis longus origin

Answer 55

Posterior ulna, radius, interosseous membrane

Question 56

Abductor pollicis longus insertion

Answer 56

Base of MCI

Question 57

Abductor pollicis longus innervation

Answer 57

Posterior interosseous

Question 58

Abductor pollicis longus action

Answer 58

Abduction of pollex

Question 59

Extensor indicis origin

Answer 59

Posterior ulna, interosseous membrane

Question 60

Extensor indicis innervation

Answer 60

Posterior interosseous

Question 61

Extensor indicis action

Answer 61

Extension of MCP joint of digit 2

Question 62

Extensor pollicis longus origin

Answer 62

Posterior ulna and interosseous membrane

Question 63

Extensor pollicis longus insertion

Answer 63

Base of distal phalanx of pollex

Question 64

Extensor pollicis longus innervation

Answer 64

Posterior interosseous

Question 65

Extensor pollicis longus action

Answer 65

Extension of IP joint of pollex

Question 66

Extensor pollicis brevis origin

Answer 66

Posterior radius and interosseous membrane

Question 67

Extensor pollicis brevis insertion

Answer 67

Base of proximal distal phalanx of pollex

Question 68

Extensor pollicis brevis innervation

Answer 68

Posterior interosseous