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Upper Limb > Radioulnar joints > Flashcards

Radioulnar joints Flashcards

1
Q

What are the two radioulnar joints?

A

Proximal radioulnar joint

Distal radioulnar joint

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2
Q

Where is the proximal radioulnar joint located?

A

Distal to elbow joint

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3
Q

What is the joint capsule of the proximal radioulnar joint?

A

The same as the joint capsule of the elbow joint

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4
Q

What are the articulating surfaces of the proximal radioulnar joint?

A

Head of radius

Radial notch of ulna

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5
Q

What is the ligament of the proximal radioulnar joint?

A

The annular ligament

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6
Q

Where does the annular ligament attach?

A

Anterior and posterior ulna

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7
Q

What does the annular ligament do?

A

Holds the radial head in place

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8
Q

What is the annular ligament lined with? Why?

A

Synovial membrane
To reduce friction between the head of the radius and the annular ligament
so the head of the radius can spin in the annular ligament to produce movement

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9
Q

How is movement produced at the proximal radioulnar joint?

A

By head of radius rotating in annular ligament

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10
Q

Where is the distal radioulnar joint located?

A

Proximally to wrist joint

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11
Q

What are the articulating surfaces of the distal radioulnar joint?

A

Head of ulna

Ulnar notch of radius

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12
Q

What are the ligaments of the distal radioulnar joint?

A

Anterior ligament - strengthens joint anteriorly

Posterior ligament - strengthens joint posteriorly

Articular disk

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13
Q

What is the articular disk?

A

Fibrocartilaginous ligament

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14
Q

What does the articular disk attach to?

A

Radius and ulna

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15
Q

What are the functions of the articular disk?

A

Hold radius and ulna together

Seperate distal radioulnar joint from wrist joint

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16
Q

How is movement produced at the distal radioulnar joint?

A

Ulnar notch of radius

slides over head of ulna

17
Q

What type of joint are the radioulnar joints?

A

Synovial joint

Pivot type

18
Q

What are the movements of the radioulnar joints?

A

Pronation

Supination

19
Q

Which muscles produce pronation at the radioulnar joints?

A

Pronator teres

Pronator quadratus

20
Q

Which muscles produce supination at the radioulnar joints?

A

Biceps brachii

Supinator

21
Q

What is the interosseus membrane?

A

Sheet of connective tissue between radius and ulna

22
Q

Where does the interosseus membrane attach?

A

Lateral border of ulna

Medial border of radius

between proximal and distal radioulnar joints

23
Q

How does vasculature pass through the interosseus membrane?

A

Interosseus membrane contains small holes for forearm vasculature to pass through

24
Q

What are the functions of the interosseus membrane?

A

Hold radius and ulna together for stability

Site of attachment for muscles in forearm

Transfers force from radius to ulna

Upper Limb (23 decks)

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