THE ELBOW: Muscles

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THE ELBOWMuscles
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MUSCLES

• Biceps brachii
• Brachialis
• Brachioradialis
• Pronator teres
• Pronator quadratus
• Supinator

• Triceps
• Anconeus

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Biceps Brachii

• Origin
• Short Coracoid process
• Long Lip of glenoid fossa
• Insertion
• Radial tuberosity
• Actions
• Flexion of elbow
• Supination of forearm
• Weak flexion of shoulder
• Stronger with forearm supinated e.g. pull-ups

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Brachialis

• Origin
• Distal half of anterior surface of humerus
• Insertion
• Coronoid process
• Actions
• Flexion of elbow
• Pure elbow flexor
• Isolated somewhat with the forearm pronated

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Brachioradialis
Anterior to elbow joint

• Origin
• Lateral ridge of distal humerus
• Insertion
• Lateral surface of distal radius near the styloid
  process
• Actions
• Flexion of elbow
• Supination of forearm
• Pronation of forearm
• Most effective as a flexor with forearm in
  neutral forearm position

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Pronator Teres

• Origin
• Medial epicondyle of humerus Coronoid process of
  ulna
• Insertion
• Lateral surface of mid-shaft of radius
• Actions
• Pronation
• Weak flexion

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Pronator Quadratus

• Origin
• Distal, anterior end of ulna
• Insertion
• Distal, anterior end of radius
• Actions
• Pronation
• Removing a screw with the right hand

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Supinator

• Origin
• Lateral epicondyle, Posterior-lateral surface of
  ulna
• Insertion
• Proximal, lateral surface of the radius
• Actions
• Supination
• Inserting a screw with right hand

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Triceps Brachii

• Origin
• Long Lip of glenoid fossa
• Lateral Proximal, posterior surface of humerus
• Medial Distal ? of posterior surface or humerus
• Insertion
• Olecranon process of ulna
• Actions
• Extension of elbow
• Long head extension of shoulder and adduction of
  the shoulder.

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Triceps Brachii

• Pushing movements
• Push-ups
• Bench press
• Dips
• Overhead press
• Throwing motions

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Anconeus

• Origin
• Lateral epicondyle
• Insertion
• Lateral side of olecranon process
• Actions
• Extension of elbow