The Wrist and Hand Joints
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Transcript of The Wrist and Hand Joints
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The Wrist and Hand Joints
Anatomy and Physiology of Human Movement
420:050
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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
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Objectives
Bones, bony landmarks and joints Muscles Movements
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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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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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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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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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Objectives
Bones, bony landmarks and joint Muscles Movements
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Wrist and Hand Muscles
Extrinsic muscles (15) All multiarticular
Elbow/wrist/hand (1) Elbow/wrist (6) Wrist/hand (8)
Intrinsic muscles (18)
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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
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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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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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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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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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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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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
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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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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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Attachment Rules
Wrist/Hand Muscles Wrist Flexors
Proximal: Anterior or Posterior forearm Distal: Depends
Wrist Extensors Proximal: Anterior or Posterior forearm Distal: Depends
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Intrinsic Muscles (18)
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