Elbow (Week 9) Flashcards
Bones of the elbow joint
Humerus, Radius, Ulna
Articulations of elbow joint
Humeroradial, Humeroulnar
Movements of Elbow
Flexion, Extension
Proximal Radioulnar Joint Movements
Pronation, Supination
Proximal Radioulnar Joint Components
- Head of radius
- Radial notch of ulna
Elbow Joint Ligaments
Proximal radial collateral ligament
Proximal ulnar collateral ligament
Anular ligament of radius
Proximal radial collateral ligament att.
- lateral epicondyle of humerus to anular
ligament of radius
Proximal ulnar collateral ligament att.
medial epicondyle of humerus to coronoid
process and olecranon of ulna
Anular ligament of radius att.
encircles and holds radial head in radial
notch of ulna
Triceps Brachii Att.
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
Triceps Brachii A/NS
Action: elbow extension
NS: radial n.
Anconeus Att.
P: lateral epicondyle of humerus
D: olecranon process and superior
posterior ulna
Anconeus A/NS
Action: elbow extension; dynamic
stabiliser of elbow
NS: radial n.
Brachioradialis Att.
P: proximal 2/3 of lateral supraepicondylar ridge of humerus
D: lateral distal radius
Brachioradialis A/NS
Action: elbow flexor (“drinker’s
muscle”)
NS: radial n.
Extensor Carpi Radialis Longus Att.
P: lateral supra-epicondylar ridge of humerus
D: dorsal base of 2nd metacarpal
Extensor Carpi Radialis Longus A/NS
Action: wrist extension and radial deviation
(abduction)
NS: radial n.
Extensor Carpi Radialis Brevis Att.
P: lateral epicondyle of the humerus
D: dorsal base of 3rd metacarpal
Extensor Carpi Radialis Brevis A/NS
Action: wrist extension and radial deviation
NS: (deep branch) of radial n.
Extensor Digitorum Att.
P: lateral epicondyle of humerus
D: extensor expansions of digits 2-4
(more on this in the hand lecture)
Extensor Digitorum A/NS
Action: wrist, metacarpophalangeal
& interphalangeal joints extension
NS: (deep branch) of radial n.
Extensor Diigiti Minimi Att.
P: lateral epicondyle of humerus
D: extensor expansion of 5th digit
Extensor Diigiti Minimi A/NS
Action: wrist, metacarpophalageal
& interphalangeal joints extension
NS: (deep branch) of radial n.
Extensor Carpi Ulnaris Att.
P: lateral epicondyle of humerus &
ulna
D: dorsal base of 5th metacarpal
Extensor Carpi Ulnaris A/NS
Action: wrist extension and ulnar
deviation (adduction)
NS: (deep branch) of radial n.
Supinator Att.
P: lateral epicondyle of humerus,
radial collateral and anular
ligaments, crest of ulna
D: lateral proximal radius
Supinator A/NS
Action: supination of forearm
NS: (deep branch of) radial n.
Abductor Pollicis Longus Att.
P: posterior ulna, radius, and IOM
D: base of 1st metacarpal
Abductor Pollicis Longus A/NS
Action: carpometacarpal joint
abduction and extension of 1st digit
NS: posterior interosseous nerve
(radial n.)
Extensor Pollicis Brevis Att.
P: posterior radius and IOM
D: dorsal base of proximal phalanx of
1st digit
Extensor Pollicis Brevis A/NS
Action: 1st digit (thumb) extension
NS: posterior interosseous nerve
(radial n.)
Extensor Policis Longus Att.
P: posterior ulna and IOM
D: dorsal aspect of base of distal
phalanx of 1st digit
Extensor Policis Longus A/NS
Action: extension of 1st digit
NS: posterior interosseous nerve
(radial n.)
Extensor Indicis Att.
P: posterior ulna and IOM
D: extensor expansion of 2nd digit
Extensor Indicis A/NS
Action: extension of 2nd digit
NS: posterior interosseous nerve
(radial n.)
Radial Nerve Course
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
Radial Nerve Common Injuries
- Axilla
- Humeral/ Lateral epicondyle fracture
- Radial head dislocation
