Lecture 11: Antebrachium and Elbow

Question 1

Distal attachment brachioradialis

Answer 1

Distal radius, proximal to styloid process

Question 2

Proximal attachment pronator teres

Answer 2

Ulnar head- cornoid process of ulna

Humeral head- medial epicondyle and supracondylar ridge

Question 3

Distal attachment extensor carpi ulnaris

Answer 3

Dorsal aspect of base of fifth metacarpal

Question 4

Superficial muscles of posterior antebrachium

Answer 4

Brachioradialis
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum
Extensor digiti minimi
Extensor carpi ulnaris

Question 5

Proximal attachment extensor carpi radialis longus

Answer 5

Lateral supracondylar ridge of humerus

Question 6

Function of flexor digitorum superficialis

Answer 6

Flexes middle phalanges of medial four fingers
Can also flex proximal phalanges at MP joints by continued action
Capable of flexing each finger independently

Question 7

Innervation pronator teres

Answer 7

Median nerve C6-7

Question 8

Distal attachment flexor digitorum profundus

Answer 8

Distal phalanges 2-5

Question 9

Superficial muscles of anterior compartment include

Answer 9

Pronator teres
Flexor carpi radialis
Palmaris longus (sometimes absent)
Flexor carpi ulnaris

Question 10

Innervation of flexor pollicus longus

Answer 10

Median nerve C8-T1

Question 11

Brachioradialis proximal attachment

Answer 11

Proximal 2/3 of supraepicondylar ridge of humerus (lateral side)

Question 12

Function of flexor digitorum profundus

Answer 12

Only muscle that can flex distal IP joints of the fingers

Can flex the index finger independently

Question 13

Action of extensor carpi radialis longus

Answer 13

Extends and abducts hand at wrist

Question 14

Deep muscles of posterior antebrachium emerge from

Answer 14

Emerge from antebrachium between extensor carpi radialis and extensor digitorum muscles

Question 15

Innervation extensor carpi radialis longus

Answer 15

Radial nerve C6-7

Question 16

Proximal attachment extensor carpi radialis brevis

Answer 16

Lateral epicondyle of humerus

Question 17

Blood supply extensor carpi ulnaris

Answer 17

Radial collateral, recurrent interosseous, posterior interosseous arteries

Question 18

Innervation of supinator

Answer 18

Deep branch of radial nerve C7-8

Question 19

Proximal attachment supinator

Answer 19

Lateral epicondyle of humerus
Radial collateral and annular ligaments
Ulnar crest

Question 20

Distal attachment flexor pollicus longus

Answer 20

Distal phalanx of thumb

Question 21

Distal attachment extensor carpi radialis longus

Answer 21

Dorsal aspect of base of 2nd metacarpal

Question 22

Common origin of muscles of posterior antebrachium

Answer 22

Lateral epicondyle of humerus

Question 23

Common function of muscles of posterior antebrachium

Answer 23

Primarily wrist and hand extensors

Question 24

Proximal attachment of flexor digitorum superficialis

Answer 24

Humero-ulnar head

Radial head

Question 25

Innervation for muscles of posterior antebrachium

Answer 25

Radial nerve via the deep branch of the radial nerve or the posterior interosseous nerve

Question 26

Blood supply extensor carpi radialis brevis

Answer 26

Radial collateral, radial recurrent, recurrent interosseous, posterior interosseous arteries

Question 27

Common origin of the anterior compartment muscles

Answer 27

Medial epicondyle of humerus

Question 28

Common function of anterior compartment muscles

Answer 28

Wrist and digit flexion

Question 29

Proximal attachment extensor digitorum

Answer 29

Lateral epicondyle of humerus

Question 30

Function of flexor pollicus longus

Answer 30

Flexes distal phalanx of thumb

Question 31

Innervation for flexor digitorum profundus

Answer 31

Median nerve via anterior interosseous nerve and ulnar nerve C8-T1

Question 32

Innervation extensor digit minimi

Answer 32

Posterior interosseus nerve C7-8

Question 33

Distal attachment extensor digit minimi

Answer 33

Extensor expansion of 5th finger

Question 34

Distal attachment pronator quadratus

Answer 34

Distal third of radius

Question 35

Innervation of extensor digitorum

Answer 35

Posterior interosseous nerve C7-8

Question 36

Intermediate muscles of anterior compartment include

Answer 36

Flexor digitorum superficialis

Question 37

Blood supply extensor carpi radialis longus

Answer 37

Radial collateral, radial recurrent, recurrent interosseous, posterior interosseous

Question 38

Blood supply brachioradialis

Answer 38

Radial collateral artery, radial recurrent artery, radial artery

Question 39

Distal attachment pronator teres

Answer 39

Middle third of lateral surface of radius

Question 40

Blood supply extensor digitorum

Answer 40

Posterior interosseous, recurrent interosseous, perforating branch of anterior interosseous arteries

Question 41

Action of brachioradialis

Answer 41

Flexes forearm when it is pronated

Question 42

Proximal attachment of flexor digitorum profundus

Answer 42

Proximal two-thirds of anterior surface of ulna and interosseous membrane

Question 43

Action extensor carpi ulnaris

Answer 43

Extends and adducts hand at wrist

Question 44

Deep muscles of posterior antebrachium include

Answer 44

``` Abdcutor pollicus longus Extensor pollicus longus Extensor pollicus brevis Extensor indicis Supinator ```

Question 45

Blood supply extensor digit minimi

Answer 45

Posterior interosseous, recurrent interosseous, perforating branch of anterior interosseous arteries

Question 46

Innervation extensor carpi ulnaris

Answer 46

Posterior interosseous nerve C7-8

Question 47

Innervation pronator quadratus

Answer 47

Anterior interosseous branch of median nerve C8-T1

Question 48

Innervation extensor carpi radialis brevis

Answer 48

Deep branch of radial nerve C7-8

Question 49

Proximal attachment extensor carpi ulnaris

Answer 49

Lateral epicondyle of humerus and posterior border of ulna

Question 50

Action pronator teres

Answer 50

Pronates forearm | Flexes antebrachium

Question 51

Innervation brachioradialis

Answer 51

Radial nerve C5-7

Question 52

Distal attachment supinator

Answer 52

Proximal 1/3 of radius

Question 53

Action pronator quadratus

Answer 53

Pronates forearm, helps interosseous membrane to hold ulna/radius together

Question 54

Proximal attachment pronator quadratus

Answer 54

Distal third of ulna

Question 55

Actions of extensor digitorum

Answer 55

Extends medial 4 fingers at metacarpophalangeal joints and somewhat at interphalangeal joints

Question 56

Proximal attachment extensor digiti minimi

Answer 56

Lateral epicondyle of humerus

Question 57

Distal attachment flexor digitorum superficialis

Answer 57

Shafts of middle phalanges of digits II-V

Question 58

Proximal attachment of flexor pollicus longus

Answer 58

Mid-anterior surface of radius and interosseous membrane

Question 59

Innervation of anterior compartment muscles

Answer 59

Median and ulnar nerves

Question 60

Deep muscles of anterior antebrachium

Answer 60

Flexor pollicus longus Pronator quadratus Ulnar head of pronator teres Flexor digitorum profundus

Question 61

Distal attachment extensor digitorum

Answer 61

Extensor expansions of medial 4 fingers

Question 62

Action supinator

Answer 62

Supinates forearm | Brings radius back to anatomical position

Question 63

Blood supply to flexor digitorum profundus

Answer 63

Anterior interosseous artery

Question 64

Distal attachment extensor carpi radialis brevis

Answer 64

Dorsal aspect of base of 3rd metacarpal

Question 65

Actions of extensor digit minimi

Answer 65

Extends 5th finger at metacarpophalangeal joint and somewhat at interphalangeal joint

Question 66

Actions of extensor carpi radialis brevis

Answer 66

Extends and abducts hand at wrist

Question 67

Innervation of flexor digitorum superficialis

Answer 67

Median nerve C7-8, T1