The Brachium and Elbow

Question 1

Primary supinator of hand

Answer 1

Biceps brachii

Question 2

Posterior compartment of brachium innervated by…

Answer 2

Radial nerve

Question 3

Anterior compartment of the brachium innervated by…

Answer 3

Musculocutaneous nerve

Question 4

Posterior compartments are

Answer 4

Extensors

Question 5

Anterior compartment are

Answer 5

Flexors

Question 6

Movements of elbow joint

Answer 6

Flexion, pronation, supination

Question 7

Ligamentous support of elbow

Answer 7

Anular ligament, ulnar collateral ligament (anterior & posterior)

Question 8

Nursemaid’s Elbow

Answer 8

Injury to radial nerve, not in a lot of pain, but annular ligament is not attached

Question 9

Anterior brachium muscles

Answer 9

Biceps brachii, brachialis, coracobrachilias

Question 10

Coracobrachialis function

Answer 10

Flexes GH joint

Question 11

Brachialis function

Answer 11

Flexes elbow

Question 12

Innervation of anterior arm

Answer 12

Musculocutaneous nerve

Question 13

Posterior brachium muscle function

Answer 13

Extension

Question 14

Innervation of posterior brachium muscles

Answer 14

Radial nerve

Question 15

Components of posterior brachium

Answer 15

Lateral head, medial head, and long head of triceps brachii, anconeus

Question 16

Major structures in anterior compartment

Answer 16

Musculocutaneous nerve, brachial artery, median nerve

Question 17

Major structures in posterior compartment

Answer 17

Circumflex scapular artery, axillary nerve, radial nerve, profunda brachii (branch of brachial artery)

Question 18

Supracondylar fracture injury

Answer 18

Radial nerve, median nerve, brachial artery, partial ulnar nerve

Question 19

Greater tuberosity fracture displaces

Answer 19

Supraspinatus

Question 20

Lesser tuberosity displaces

Answer 20

Subcapularis muscle

Question 21

Medial epicondyle displaces

Answer 21

Ulnar nerve

Question 22

Cubital fossa components

Answer 22

TAN -> tendon of biceps brachii, brachial artery, median nerve

Question 23

Brachial artery branches into…

Answer 23

Radial and ulnar arteries

Question 24

Brachial artery anastamoses with

Answer 24

Profunda brachii artery

Question 25

Ligation of brachial artery between the subscapular and profunda brachial arteries will result in…

Answer 25

Greatly impaired flow to the forearm and hand

Question 26

Ligation of the brachial artery distal to the inferior ulnar collateral artery will…

Answer 26

Maintain blood flow to the hand through the collateral channels around the elbow

Question 27

Compression site for brachial artery

Answer 27

Distal humerus

Question 28

Compression site for radial artery

Answer 28

Between tendons of brachioradialis and flexor carpi ulnaris; snuff box, 1st dorsal digit space

Question 29

Compression site for ulnar artery

Answer 29

Lateral (and proximal) to pisiform

Question 30

Sympathetic innervation to the spinal cord levels

Answer 30

T2-T7

Question 31

Injury at elbow will impact

Answer 31

MEDIAN NERVE

Question 32

S/S of median nerve injury

Answer 32

“Ape hand” appearance due to decreased wrist flexion, supination of the hand (both pronators are paralyzed), thumb in neutral position (laterally rotated, adducted and cannot be opposed) and wasting of the thenar eminence, ulnar deviation of wrist with attempted wrist flexion

Question 33

Supracondylar humerus fractures may selectively injure…

Answer 33

Anterior interosseous nerve (AIN)

Question 34

the Terrible triad

Answer 34

injury to the elbow characterized by dislocation, fracture of the radial head, and avulsion of the coronoid process

Question 35

Dislocation of radial head

Answer 35

a sudden “yank” on the arm of a young child (in extension and
pronation) can tear the annular ligament resulting in partial (subluxation) or complete dislocation; often referred to as “nursemaid’s elbow” or “babysitter’s elbow”

Question 36

Name of fracture that showcases a dinner fork appearance due to distal radius fracture

Answer 36

Colle’s fracture

Question 37

Tommy John surgery at most risk for

Answer 37

Injuring ulnar nerve as it passes posterior to the medial epicondyle