Elbow (Week 9)

Question 1

Bones of the elbow joint

Answer 1

Humerus, Radius, Ulna

Question 2

Articulations of elbow joint

Answer 2

Humeroradial, Humeroulnar

Question 3

Movements of Elbow

Answer 3

Flexion, Extension

Question 4

Proximal Radioulnar Joint Movements

Answer 4

Pronation, Supination

Question 5

Proximal Radioulnar Joint Components

Answer 5

• Head of radius
• Radial notch of ulna

Question 6

Elbow Joint Ligaments

Answer 6

Proximal radial collateral ligament
Proximal ulnar collateral ligament
Anular ligament of radius

Question 7

Proximal radial collateral ligament att.

Answer 7

• lateral epicondyle of humerus to anular
  ligament of radius

Question 8

Proximal ulnar collateral ligament att.

Answer 8

medial epicondyle of humerus to coronoid
process and olecranon of ulna

Question 9

Anular ligament of radius att.

Answer 9

encircles and holds radial head in radial
notch of ulna

Question 10

Triceps Brachii Att.

Answer 10

Proximal:
Long head: infraglenoid tubercle of scapula
Lateral head: posterior humerus superior to
radial groove
Medial head: posterior humerus inferior to
radial groove
Distal: olecranon process of ulna

Question 11

Triceps Brachii A/NS

Answer 11

Action: elbow extension
NS: radial n.

Question 12

Anconeus Att.

Answer 12

P: lateral epicondyle of humerus
D: olecranon process and superior
posterior ulna

Question 13

Anconeus A/NS

Answer 13

Action: elbow extension; dynamic
stabiliser of elbow
NS: radial n.

Question 14

Brachioradialis Att.

Answer 14

P: proximal 2/3 of lateral supraepicondylar ridge of humerus
D: lateral distal radius

Question 15

Brachioradialis A/NS

Answer 15

Action: elbow flexor (“drinker’s
muscle”)
NS: radial n.

Question 16

Extensor Carpi Radialis Longus Att.

Answer 16

P: lateral supra-epicondylar ridge of humerus
D: dorsal base of 2nd metacarpal

Question 17

Extensor Carpi Radialis Longus A/NS

Answer 17

Action: wrist extension and radial deviation
(abduction)
NS: radial n.

Question 18

Extensor Carpi Radialis Brevis Att.

Answer 18

P: lateral epicondyle of the humerus
D: dorsal base of 3rd metacarpal

Question 19

Extensor Carpi Radialis Brevis A/NS

Answer 19

Action: wrist extension and radial deviation
NS: (deep branch) of radial n.

Question 20

Extensor Digitorum Att.

Answer 20

P: lateral epicondyle of humerus
D: extensor expansions of digits 2-4
(more on this in the hand lecture)

Question 21

Extensor Digitorum A/NS

Answer 21

Action: wrist, metacarpophalangeal
& interphalangeal joints extension
NS: (deep branch) of radial n.

Question 22

Extensor Diigiti Minimi Att.

Answer 22

P: lateral epicondyle of humerus
D: extensor expansion of 5th digit

Question 23

Extensor Diigiti Minimi A/NS

Answer 23

Action: wrist, metacarpophalageal
& interphalangeal joints extension
NS: (deep branch) of radial n.

Question 24

Extensor Carpi Ulnaris Att.

Answer 24

P: lateral epicondyle of humerus &
ulna
D: dorsal base of 5th metacarpal

Question 25

Extensor Carpi Ulnaris A/NS

Answer 25

Action: wrist extension and ulnar
deviation (adduction)
NS: (deep branch) of radial n.

Question 26

Supinator Att.

Answer 26

P: lateral epicondyle of humerus,
radial collateral and anular
ligaments, crest of ulna
D: lateral proximal radius

Question 27

Supinator A/NS

Answer 27

Action: supination of forearm
NS: (deep branch of) radial n.

Question 28

Abductor Pollicis Longus Att.

Answer 28

P: posterior ulna, radius, and IOM
D: base of 1st metacarpal

Question 29

Abductor Pollicis Longus A/NS

Answer 29

Action: carpometacarpal joint
abduction and extension of 1st digit
NS: posterior interosseous nerve
(radial n.)

Question 30

Extensor Pollicis Brevis Att.

Answer 30

P: posterior radius and IOM
D: dorsal base of proximal phalanx of
1st digit

Question 31

Extensor Pollicis Brevis A/NS

Answer 31

Action: 1st digit (thumb) extension
NS: posterior interosseous nerve
(radial n.)

Question 32

Extensor Policis Longus Att.

Answer 32

P: posterior ulna and IOM
D: dorsal aspect of base of distal
phalanx of 1st digit

Question 33

Extensor Policis Longus A/NS

Answer 33

Action: extension of 1st digit
NS: posterior interosseous nerve
(radial n.)

Question 34

Extensor Indicis Att.

Answer 34

P: posterior ulna and IOM
D: extensor expansion of 2nd digit

Question 35

Extensor Indicis A/NS

Answer 35

Action: extension of 2nd digit
NS: posterior interosseous nerve
(radial n.)

Question 36

Radial Nerve Course

Answer 36

On reaching the lateral side of the humerus it
passes between brachialis and brachioradialis,
and more distally - ECRL
* Anterior to the lateral epicondyle it divides into
superficial and deep branches
* Superficial radial nerve is sensory only (to
snuffbox)
* Deep radial nerve (aka posterior interosseous
nerve) is a motor nerve supplying muscles of
the posterior forearm
* Passes through supinator

Question 37

Radial Nerve Common Injuries

Answer 37

• Axilla
• Humeral/ Lateral epicondyle fracture
• Radial head dislocation