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Biomechanics presentation
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Biomechanics presentation

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  • 1. extensor carpi ulnaris  Origin: Lateral epicondyle of humerus and posterior border of ulna  Insertion: Base of 5th metacarpal  Action: Extends and adducts hand at wrist joint
  • 2. extensor carpi radialis brevis Origin: Lateral epicondyle of humerus Insertion: Base of 3rd metacarpal Action: acts to extend and abduct the wrist
  • 3. Flexor digitorum superficialis  Origin: Humeroulnar head: medial epicondyle of humerus, ulnar collateral ligament, and coronoid process of ulna; Radial head: superior half of anterior border of radius  Insertion: Bodies of middle phalanges of digits 2 – 5  Action: extrinsic flexor muscle of the fingers at the proximal interphalangeal joints
  • 4. flexor digitorum profundus  Origin: Proximal 3/4 of medial and anterior surfaces of ulna and interosseous membrane  Insertion: Base of the distal phalanx of digits 2 – 5  Action: flexor digitorum profundus helps flex the fingers. The muscle originates in the upper part of the ulna bone and stretches to insertion at the distal phalanges in the tips of the fingers.
  • 5. Flexor pollicis longus  Origin: Anterior surface of radius and adjacent interosseous membrane  Insertion: Base of distal phalanx of thumb  Action: Flexes phalanges of 1st digit (thumb)
  • 6. extensor digitorum  Origin: Lateral epicondyle of humerus  Insertion: Extensor expansions of medial four digits  Action: Extends medial four digits at metacarpophalangeal joints; Extends hand at wrist joint
  • 7. extensor indicis  Origin: Posterior surface of ulna and interosseous membrane  Insertion: Extensor expansion of 2nd digit  Action: Extends 2nd digit and helps to extend hand
  • 8. extensor digiti minimi  Origin: Lateral epicondyle of humerus  Insertion: Extensor expansion of 5th digit  Action: Extends 5th digit at metacarpophalangeal and interphalangeal joints
  • 9. Extensor pollicis longus  Origin: Posterior surface of middle 1/3 of ulna and interosseous membrane  Insertion: Base of distal phalanx of thumb  Action: Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints
  • 10. extensor pollicis brevis  Origin: Posterior surfaces of radius and interosseous membrane Insertion: Base of proximal phalanx of thumb  Action: Extends proximal phalanx of thumb at carpometacarpal joint
  • 11. abductor pollicis longus  Origin: Posterior surfaces of ulna, radius and interosseous membrane  Insertion: Base of 1st metacarpal  Action: Abducts thumb and extends it at carpometacarpal joint

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