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The Wrist and Hand Joints Anatomy and Kinesiology 420:024.

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Presentation on theme: "The Wrist and Hand Joints Anatomy and Kinesiology 420:024."— Presentation transcript:

1 The Wrist and Hand Joints Anatomy and Kinesiology 420:024

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

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6 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

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

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10 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

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13 Objectives Bones, bony landmarks and joint Muscles Movements

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

15 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

16 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

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18 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

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21 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

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25 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

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28 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

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30 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

31 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

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35 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

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

39 Intrinsic Muscles (18)

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