Radioulnar Joint Flashcards Preview

ESA 2- Musculoskeletal System > Radioulnar Joint > Flashcards

Flashcards in Radioulnar Joint Deck (32):
1

What are the radioulnar joints?

Two locations in which the ulna and radius articulate in the forearm

2

Where is the proximal radioulnar joint?

Immediately distal to the elbow joint

3

What is the proximal radioulnar joint the articulation of?

The head of the radius, and the radial notch of the ulna

4

Where is the distal radioulnar joint?

Just proximally to the wrist joint

5

What is the distal radioulnar joint the articulation of?

Between the radial notch of the radius and ulnar head

6

What are the radioulnar joint classified?

Pivot joints

7

What are the radioulnar joints responsible for?

Pronation and supination of the forearm

8

What is the proximal radioulnar joint enclosed within?

The same articular capsule as the elbow joint

9

What is the proximal radioulnar joint formed from?

An articulation between the head of the radius and the radial notch of the ulna

10

How is the radial head held in place?

By the annular radial ligament

11

What does the annular radial ligament form?

A ‘collar’ around the joint

12

What is the annular radial ligament lined with?

A synovial membrane

13

What is the purpose of the synovial membrane of the annular radial ligament?

It reduces friction during movement

14

How is movement at the proximal radioulnar joint produced?

By the head of the radius rotating within the annular ligament

15

What movements are possible at the proximal radioulnar joint?

Pronation and supination

16

What is pronation at the proximal radioulnar joint produced by?

The pronator quadratus and the pronator teres

17

What is supination at the proximal radioulnar joint produced by?

The supinator and biceps brachii

18

What is the distal radioulnar joint an articulation between?

The ulnar notch of the radius, and the ulnar head

19

What strengthens the distal radioulnar joint?

Anterior and posterior ligaments 
The articular disc

20

What is the articular disc?

A fibrocartilaginous ligament

21

What is the function of the articular disc?

Binds the radius and ulna together, and holds them together during movement at the joint 
Separates the distal radioulnar joint from the wrist joint

22

What does the distal radioulnar joint allow for?

Pronation and supination

23

What happens to the ulnar notch of the radius in movements of the distal radioulnar joints?

It slides over the head of the ulnar

24

What produces pronation at the distal radioulnar joints?

The pronator quadratus and pronator teres

25

What produces supination at the distal radioulnar joint?

Supinator and biceps and brachii

26

What is the interosseous membrane?

A sheet of connective tissue that joins the radius and ulna together between the radioulnar joints

27

What does the interosseous membrane span?

The distance between the medial radial border and the lateral ulnar border

28

What is present in the interosseous membrane?

Small holes

29

Why are there small holes in the interosseous membrane?

As a conduit for the forearm vasculature

30

What are the major functions of the interosseous membrane?

Holds radius and ulna together during pronation and supination of the forearm, providing additional stability 
Acts as a site of attachment for muscles in the anterior and posterior compartments of the forearm 
Transfers forces from the radius to the ulna

31

How can the radius and ulna be thought of when dealing with injury?

As a ring

32

What is the result of the radius and ulna being thought of as a ring?

A ring usually breaks in two places, meaning that a fracture to the radius usually causes a fracture or dislocation to the other bone