Forearm (Ulna and Radius)

Question 1

Is the ulna located laterally or medially in the body?

Answer 1

Medial

Question 2

The Coronoid process articulates with what part of the humerus?

Answer 2

Trochlea of the humerus

Question 3

The Ulnar tuberosity is the attachment pint for which muscle?

Answer 3

Brachialis

Question 4

What is the “elbow” that can be palpated?

Answer 4

olecranon process

Question 5

What is the stabilizing bone of the forearm?

Answer 5

Ulna

Question 6

Which side of the distal end of the ulna is the styloid process located?

Answer 6

Medial

Question 7

Which bone reaches the wrist ONLY?

Answer 7

Radius

Question 8

Does the radius have anything to do with the elbow joint?

Answer 8

No.

Question 9

Describe the shape of the Ulna.

Answer 9

Larger towards the humerus, tapers downward to the wrist but does not touch the wrist joint.

Question 10

What separates the 2 process of the ulna?

Answer 10

trochlear notch

Question 11

What are the 2 processes of the proximal end of the ulna?

Answer 11

olecranon process and coronoid process

Question 12

What is bursitis? How is it caused?

Answer 12

inflammation of the bursal sac, direct trauma or repetitive friction

Question 13

What 2 structure lie between the elbow and the skin?

Answer 13

olecranon bursa and triceps tendon

Question 14

Describe the shape of the radius.

Answer 14

Skinny proximally and enlarged distally.

Question 15

The Ulnohumeral joint (elbow) is what type of joint?

Answer 15

Synovial Hinge (uniaxial)

Question 16

How and why is there a carrying angle? How big is the carrying angle?

Answer 16

The trochlea is larger/thicker medially therefore the distal arm migrates laterally to accommodate the width of the hips. Usually the carrying angle is 15 degrees.

Question 17

Is the radiohumeral joint part of the elbow?

Answer 17

no

Question 18

Where does the radius articulate with the humerus?

Answer 18

Capitulum of the humerus

Question 19

The medial collateral ligament of the elbow extends from where to where?

Answer 19

Medial epicondyle of the humerus to the top of the ulna

Question 20

Which collateral ligament restricts a valgus stress?

Answer 20

Medial Lateral Collateral ligament (MCL)

Question 21

A valgus force comes from which direction?

Answer 21

from lateral side pushing medially

Question 22

Which collateral ligament extends from the lateral epicondyle to the annular ligament?

Answer 22

Lateral Collateral Ligament (LCL)

Question 23

A Varus stress is restricted by which collateral ligament?

Answer 23

Lateral. (LCL)

Question 24

A Varus force runs from which direction?

Answer 24

From the medial side and pushes laterally

Question 25

What type of joint is the proximal radioulnar joint?

Answer 25

pivot joint

Question 26

What is the annular ligament composed of?

Answer 26

ring of hyaline cartilage

Question 27

What does the annular ligament do?

Answer 27

Holds the radial head into the radial notch and allows free rotation of the radius along its longitudinal axis

Question 28

What is the intermediate radioulnar joint?

Answer 28

Interosseus Membrane

Question 29

In which direction does the Interossues membrane run?

Answer 29

Inferiorly and medially

Question 30

Structurally what type of joint is the intermediate radioulnar joint?

Answer 30

Fibrous (for stability)

Question 31

What articulation forms the distal radioulnar joint?

Answer 31

Ulnar notch of the radius and the distal end of the ulna.

Question 32

Which radioulnar joint allows for the radius to cross over the ulna in pronation/supination?

Answer 32

Distal radioulnar joint

Question 33

What are the 3 radioulnar joint?

Answer 33

- Proximal - Intermediate /Interosseus - Distal

Question 34

What is the structural classification of the intermediate radioulnar joint? a) synovial b) cartilaginous c) fibrous d) diarthroses e) Synarthrosis

Answer 34

c) fibrous

Question 35

In full elbow extension, what bony landmark makes contact with the radial fossa of the humerus? a) olecranon process b) trochlea c) Capitulum d) trochlear notch e) radial head

Answer 35

e) radial head