Upper arm anatomy

Question 1

How many muscles are in the anterior compartment of the arm?

Answer 1

3

Question 2

How many muscles are in the posterior compartment of the arm?

Answer 2

1

Question 3

Which muscles are in the anterior compartment of the arm?

Answer 3

Biceps
Coracobrachialis
Brachialis

Question 4

Which muscle is in the posterior compartment of the arm?

Answer 4

Triceps

Question 5

What is the blood supply to the anterior compartment of the arm?

Answer 5

Branches of the brachial artery

Question 6

What is the function of the biceps?

Answer 6

Forearm supination
Elbow and shoulder flexion

Question 7

What is the innervation of the biceps?

Answer 7

MUsculocutaneous nerve.

Question 8

Which spinal cord segment does the bicep tendon reflex test?

Answer 8

C6

Question 9

What is the function of the coracobrachialis?

Answer 9

Flexion of the shoulder
Weak shoulder adduction

Question 10

What is the innervation of the coracobrachialis?

Answer 10

Musculocutaneous nerve

Question 11

The brachial forms the floor of what?

Answer 11

Cubital fossa

Question 12

What is the function of the brachialis?

Answer 12

Elbow flexion

Question 13

What is the innervation fo the brachialis?

Answer 13

Musculocutaneous nerve (contributions from radial nerve)

Question 14

What is the main innervation for the anterior compartment of the upper arm?

Answer 14

Musculocutaneous

Question 15

What injury can cause the ‘Popeye sign’?

Answer 15

Complete rupture of the long head of the biceps.

Question 16

What is the arterial supply to the posterior compartment of the upper arm?

Answer 16

Profunda brachii artery

Question 17

What is the function of the triceps?

Answer 17

Elbow extension.

Question 18

What is the innervation of the triceps?

Answer 18

Radial nerve.

Question 19

What spinal segment does the triceps reflex test?

Answer 19

C7

Question 20

Where are the infraclavicular node groups found?

Answer 20

Between the pectoralis major and deltoid, immediately below the clavicle.

Question 21

What regions do the infraclavicular lymph nodes drain?

Answer 21

Axilla and anterior thoracic wall

Question 22

Where are the supratrochlear lymph nodes found?

Answer 22

Proximal to the medial epicondyle of the humerus.

Question 23

What regions do the supratrochlear lymph nodes drain?

Answer 23

Fingers 3-5 and the medial forearm.

Question 24

What type of joint is the elbow?

Answer 24

Hinge synovial joint

Question 25

How many articulations does the elbow joint have?

Answer 25

2

Question 26

At the elbow, the trochlear notch of the ulna articulates with....?

Answer 26

The trochlea of the humerus.

Question 27

At the elbow, the head of the radius articulates with....?

Answer 27

The capitulum of the humerus.

Question 28

What are the 2 articulations that form the elbow joint?

Answer 28

The trochlear notch of the ulna + trochlea of humerus AND The head of the radius and the capitulum of the humerus

Question 29

What do the thickenings of the elbow joint capsule at the medial and lateral aspects of the elbow joint form?

Answer 29

The collateral ligaments.

Question 30

What is the function of the collateral ligaments in the elbow?

Answer 30

They stabilise the flexing and extending motion of the arm.

Question 31

Which collateral ligement blends with the annular ligament?

Answer 31

The lateral collateral ligament

Question 32

Which movements does the annular ligament allow for?

Answer 32

Pronation and supination.

Question 33

What is the third articulation of the elbow?

Answer 33

Proximal radioulnar joint between the radial head and radial notch. **often considered a separate articulation.

Question 34

Which muscles allow for elbow flexion?

Answer 34

Triceps Anconeus

Question 35

Which muscles allow for elbow extension?

Answer 35

Brachialis Biceps Brachioradialis

Question 36

How are elbow dislocations named?

Answer 36

By position of the ulna and radius (not humerus)

Question 37

Which area is affected by tennis elbow?

Answer 37

Lateral epicondylitis

Question 38

Which area is affected by golfer's elbow?

Answer 38

Medial epicondylitis

Question 39

What movement do the proximal and distal radio ulnar joints allow for?

Answer 39

Rotational movement of the 2 bones (pronation and supination).

Question 40

What forms the proximal radio ulnar articulation?

Answer 40

Head of radius and radial notch on ulna.

Question 41

What holds the radial head in place at the proximal radio ulnar joint?

Answer 41

Annular radial ligament.

Question 42

What muscles allow for pronation at the proximal radio ulnar joint?

Answer 42

Pronator quadrates and pronator teres.

Question 43

Which muscles allow for supination at the proximal radio ulnar joint?

Answer 43

Supinator and biceps.

Question 44

What forms the articulation of the distal radioulnar joint?

Answer 44

Ulnar head and ulnar notch of radius.

Question 45

What holds the radius and ulna together at the distal radio ulnar joint?

Answer 45

Articular disc.

Question 46

Which muscles allow for pronation at the distal radioulnar joint?

Answer 46

Pronator teres and pronator quadratus.

Question 47

Which muscles allow for supination at the distal radio ulnar joint?

Answer 47

Supinator and biceps.

Question 48

What holds the radius and ulna together during pronation and supination of the forearm?

Answer 48

Interosseous membrane.

Question 49

What are the 2 common fractures affecting the forearm?

Answer 49

Monteggia and Galeazzi

Question 50

What is a Monteggia fracture?

Answer 50

Fracture of proximal ulna AND dislocation of radial head proximally.

Question 51

What is a Galeazzi fracture?

Answer 51

Fracture of distal radius and dislocation of ulnar head distally.

Question 52

What is the function of the latissimus dorsi?

Answer 52

Adduct, extend and internally rotate humerus