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The Wrist and Hand Joints

The Wrist and Hand Joints. Anatomy and Physiology of Human Movement 420:050. The Wrist and Hand Joints. Many sports require precise functioning of wrist & hand Archery, bowling, golf, baseball, tennis, etc. require combined use of wrist & hand joints Very complex 29 bones 25 joints

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The Wrist and Hand Joints

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  1. The Wrist and Hand Joints Anatomy and Physiology of Human Movement 420:050

  2. The Wrist and Hand Joints • Many sports require precise functioning of wrist & hand • Archery, bowling, golf, baseball, tennis, etc. require combined use of wrist & hand joints • Very complex • 29 bones • 25 joints • 33 muscles

  3. Objectives • Bones, bony landmarks and joints • Muscles • Movements

  4. Bones • 29 bones, including radius & ulna • Carpals (8) • Two rows of 4 bones • Metacarpals (5) • Numbered 1-5 • Phalanges (14) • Three for each finger • Two for the thumb • Thumb has a sesamoid bone in its flexor tendon • Other sesamoids may occur in joints of fingers

  5. Bones • Carpal bones form a three-sided arch • Concave on palmar side • creates the carpal tunnel • Frequently a source of problems known as carpal tunnel syndrome

  6. Wrist and Hand Joints • Radiocarpal joint • Biaxial ball and socket • Intercarpal joints • Gliding/nonaxial • Carpometacarpal joints • Fingers – Gliding/nonaxial • Thumb – Biaxial saddle

  7. Wrist and Hand Joints • Metacarpophalangeal joints • Fingers – Biaxial ball and socket • Thumb – Uniaxial hinge • Proximal interphalangeal joints • Fingers – Uniaxial hinge • Distal interphalangeal joints • Fingers – Uniaxial hinge • Interphalangeal joint • Thumb – Uniaxial hinge

  8. Objectives • Bones, bony landmarks and joint • Muscles • Movements

  9. Wrist and Hand Muscles • Extrinsic muscles (15) • All multiarticular • Elbow/wrist/hand (1) • Elbow/wrist (6) • Wrist/hand (8) • Intrinsic muscles (18)

  10. Extrinsic Wrist and Hand Muscles (15) • Elbow, Wrist and Hand (3) • Elbow flexion, wrist flexion, finger flexion (1) • Elbow extension, wrist extension, finger extension (2) • Fingers 2, 3, 4, 5 • Pinky • Elbow and Wrist (6) • Elbow flexion, wrist flexion (3) • 1 wrist abductor • 1 wrist adductor • 1 flexor only • Elbow flexion, wrist extension (2) • 1 wrist abductor • 1 wrist adductor • Elbow extension, wrist extension (1) • Wrist adductor • Wrist and Hand (6) • Wrist flexion, finger flexion (1) • Wrist flexion, thumb flexion (1) • Wrist abductor • Wrist extension, index finger extension (1) • Wrist extension, thumb extension (2) • Wrist abductors • Wrist flexion, thumb abduction (1) • Wrist abductor

  11. Attachments • Elbow, Wrist and Hand (3) • Elbow flexion, wrist flexion, finger flexion (1) • Elbow extension, wrist extension, finger extension (2) • Fingers 2, 3, 4, 5 • Pinky

  12. Attachments • Elbow, Wrist and Hand (3) • Elbow flexion, wrist flexion, finger flexion (1) • Elbow extension, wrist extension, finger extension (2) • Fingers 2, 3, 4, 5 • Pinky

  13. Attachments • Elbow and Wrist (6) • Elbow flexion, wrist flexion (3) • 1 wrist abductor • 1 wrist adductor • 1 flexor only • Elbow flexion, wrist extension (2) • 1 wrist abductor • 1 wrist adductor • Elbow extension, wrist extension (1) • Wrist adductor

  14. Attachments • Elbow and Wrist (6) • Elbow flexion, wrist flexion (3) • 1 wrist abductor • 1 wrist adductor • 1 flexor only • Elbow flexion, wrist extension (2) • 1 wrist abductor • 1 wrist adductor • Elbow extension, wrist extension (1) • Wrist adductor

  15. Attachments • Elbow and Wrist (6) • Elbow flexion, wrist flexion (3) • 1 wrist abductor • 1 wrist adductor • 1 flexor only • Elbow flexion, wrist extension (2) • 1 wrist abductor • 1 wrist adductor • Elbow extension, wrist extension (1) • Wrist adductor

  16. Attachment Rules • Elbow/Wrist/Hand and Elbow/Wrist Muscles • Wrist Flexors • Proximal: Medial or Lateral epicondyle of humerus • Distal: Depends • Wrist Extensors • Proximal: Medial or Lateral epicondyle of humerus • Distal: Depends

  17. Attachments • Wrist and Hand (6) • Wrist flexion, finger flexion (1) • Wrist flexion, thumb flexion (1) • Wrist abductor • Wrist flexion, thumb abduction (1) • Wrist abductor • Wrist extension, index finger extension (1) • Wrist extension, thumb extension (2) • Wrist abductors

  18. Attachments • Wrist and Hand (6) • Wrist flexion, finger flexion (1) • Wrist flexion, thumb flexion (1) • Wrist abductor • Wrist flexion, thumb abduction (1) • Wrist abductor • Wrist extension, index finger extension (1) • Wrist extension, thumb extension (2) • Wrist abductors

  19. Attachment Rules • Wrist/Hand Muscles • Wrist Flexors • Proximal: Anterior or Posterior forearm • Distal: Depends • Wrist Extensors • Proximal: Anterior or Posterior forearm • Distal: Depends

  20. Intrinsic Muscles (18)

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