CHAPTER 16 : Forearm Elbow joint and the Back of the hand

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Blood-Supply

Cubital anastomosis

Nerve-Supply

The musculocutaneous and radial nerves (i.e. the nerves which supply the related muscles).

Movements  
  • Supination
  • Pronation

Axis passes through centre of radial head and centre of triangular ligament at the wrist.

Supination  
Performed by the Biceps brachii(1)and Supinator(2) .
Biceps brachii is the more powerful muscle especially where force is required
Supination is assisted to a slight extent by the Extensor muscles of the thumb
 
pronation  
Pronator quadratus is the prime mover in pronation
pronation is performed by the Pronator teres(1), Pronator quadratus (2) and Flexor carpi radialis.

The former two are the principal pronator muscles P. quadratus is reinforced by the P. teres during rapid and forceful pronation .
During pronation the anconeus abducts the ulna so that the latter takes the place of the distal end of the

 
Relations  

The annular ligament gives attachment to the radial collateral ligament and to supinator. It is almost subcutaneous and the head of the radius can easily be felt rotating within it just distal to the capitulum of the humerus.

Posteriorly, the interosseous recurrent artery ascends on the ligament.

Anteriorly, the ligament is crossed by the lateral edge of brachialis