2.4. The Radio-Ulnar Joint Flashcards Preview

Mariam MSK ANATOMY (Upper Limb) > 2.4. The Radio-Ulnar Joint > Flashcards

Flashcards in 2.4. The Radio-Ulnar Joint Deck (27)
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1
Q

What are the Radio-Ulnar Joints?

A

Locations at which the Radius and the Ulna unite in the Forearm

2
Q

How many Radio-Ulnar Joints are there?

A

2

3
Q

What are the names of the 2 Radio-Ulnar Joints?

A
  1. Proximal Radio-Ulnar Joint

2. Distal Radio-Ulnar Joint

4
Q

Where is the Proximal Radio-Ulnar Joint located?

A

Immediately Distal to the Elbow Joint

5
Q

What are the Articulating Surfaces in the Proximal Radio-Ulnar Joint?

A
  1. Radial Head

2. Radial Notch of the Ulna

6
Q

What Type of Joint is the Proximal Radio-Ulnar Joint?

A

Synovial Pivot

7
Q

What Encloses the Proximal Radio-Ulnar Joint?

A

The same Joint Capsule as the Elbow Joint

8
Q

What holds the Radial Head in place?

A

The Radial Annular Ligament

9
Q

How is the Radial Annular Ligament described?

A

As a “Collar” around the Joint

10
Q

What lines the Radial Annular Ligament?

A

A Synovial Membrane

11
Q

What is the purpose of the Synovial Membrane which lines the Radial Annular Ligament?

A

To reduce friction during movement

12
Q

How is movement produced at the Proximal Radio-Ulnar Joint?

A

The Radial Head rotating inside the Radial Annular Ligament

13
Q

What movements can occur at the Proximal Radio-Ulnar Joint?

A
  1. Pronation

2. Supination

14
Q

Where is the Distal Radio-Ulnar Joint located?

A

Immediately Proximal to the Wrist Joint

15
Q

What are the Articulating Surfaces in the Distal Radio-Ulnar Joint?

A
  1. Ulnar Notch of the Radius

2. Ulnar Head

16
Q

What Type of Joint is the Distal Radio-Ulnar Joint?

A

Synovial Pivot

17
Q

What Ligaments strengthen the Distal Radio-Ulnar Joint?

A
  1. Anterior Ligament
  2. Posterior Ligament
  3. Fibrocartilaginous Ligament
18
Q

What is the Fibrocartilaginous Ligament also known as?

A

Articular Disk

19
Q

What are the functions of the Articular Disk?

A
  1. Binds the Radius and the Ulna together (holds them together during movement)
  2. Separates the Distal Radio-Ulnar Joint from the Wrist Joint
20
Q

What movements can occur at the Distal Radio-Ulnar Joint?

A
  1. Pronation

2. Supination

21
Q

How is movement produced at the Distal Radio-Ulnar Joint?

A

The Ulna Notch of the Radius slides Anteriorly over the Ulnar Head

22
Q

What are the main Muscles producing Pronation?

A
  1. Pronator Quadratus

2. Pronator Teres

23
Q

What are the main Muscles producing Supination?

A
  1. Supinator

2. Biceps Brachii

24
Q

What Accessory Muscles produce Pronation?

A
  1. Flexor Carpi Radialis
  2. Palmaris Longus
  3. Brachioradialis
25
Q

What Accessory Muscles produce Supination?

A
  1. Extensor Pollicis Longus

2. Extensor Carpi Radialis Longus

26
Q

What Muscle is the most Powerful Pronator in the Forearm?

A

Pronator Teres

27
Q

What Muscle is the most Powerful Supinator in the Forearm?

A

Biceps Brachii (Only in Heavy Loads)

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