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Anatomy > Radioulnar joint > Flashcards

Radioulnar joint Flashcards

1
Q

What type of joint is the radioulnar joint?

A

A pivot joint.

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2
Q

What movement of the forarm does the radioulnar joint allow?

A

Pronation and Supination

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3
Q

How many radioulnar joints are there?

A
  1. One proximal and one distal.
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4
Q

Where is the proximal radioulnar joint?

A

Just distal to the elbow.

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5
Q

What forms the proximal radioulnar joint?

A

The radial head articulating with the radial notch on the ulna.

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6
Q

What holds the radial head in place?

A

The anular radial ligament. It is lined with synovial membane.

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7
Q

What produces pronation at the proximal radioulnar joint?

A

Pronator quadratus

pronator teres

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8
Q

What produces supination at the proximal radioular joint?

A

Supinator

Biceps Brachii

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9
Q

Where is the distal radioulnar joint?

A

Just proximal to the wrist joint

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10
Q

What articulates in the distal radioulnar joint?

A

Head of the ulnar and ulnar notch on radius

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11
Q

What does the articular disc do?

A

Bind the radius and ulna together

Separates the distsal radioulnar joint from the wrist joint

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12
Q

What moves to allow pronation and supination at the distal radioulnar joint?

A

The ulnar notch on the radius slides anteriorly over the head of the ulna

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13
Q

What causes pronation of the Distal radioulnar joint?

A

Pronator quadratus

Pronator teres

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14
Q

What causes supination of the distsal radioulnar joint?

A

Supinator

Biceps Brachii

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15
Q

What is the interosseous membrane?

A

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

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16
Q

Where does the interosseous membrane attach?

A

Medial border of the radius

Lateral border of the ulna

17
Q

What is the main functions of the interosseous membrane?

A

Holding the radius and ulna together during pronation and supination
Provides attachment for muscles
Transfer forces from the radius to the ulna

18
Q

When thinking of fractures in the forearm, what is important to remember?

A

That usually the radius and ulna will break together.

19
Q

What is a Monteggias fracture?

A

A force from behind the ulna causes the shaft to fracture and a dislocation of the radial head anteriorly at the elbow.

20
Q

What is a Galeazzi fracture?

A

There is a fracture of the radius and the ulna head is dislocated at the distal radioulnar joint.

Anatomy (45 decks)

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