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Questions and Answers
_______ & adduction, and midway between flexion & extension are movements of the wrist.
abduction
The _______ of the hand includes the distal transverse arch, proximal transverse arch, and longitudinal arch.
arches
The _______ ligament connects the radius, ulna, and metacarpal bones to carpal bones.
extrinsic
The _______ prevent the bowstring effect in the hand.
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The _______ position of the thumb involves full opposition.
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The _______ assembly includes the extensor hood mechanism that provides shortcuts for tendons.
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The _______ provides mobility for the hand in use
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The _______ is a hinge joint at the elbow
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The _______ joint depends on bony configuration for stability
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The _______ joint is a pivot joint at the elbow
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The _______ is a complex network of fibrous tissue that surrounds and stabilizes the elbow joint
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The _______ articulation prevents proximal displacement of radius and ulna during pushing movements
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The _______ ligament forms 4/5th of a ring
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The quadrate ligament limits spin of the radial head during _______ and supination
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The oblique cord is taut in _______
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The carpal bone known as the '________' has a tubercle for attachment of the FCR tendon
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The _______ bone is the 2nd most fractured bone in the hand and is part of the proximal carpal row
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The boundaries of the anatomic snuffbox are medial: EPL, lateral: APL & EPB, and it is inflamed when there is a fracture of the _______ bone
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Kienbock's Disease is associated with avascular necrosis of the _______ bone
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Preisser's Disease is related to avascular necrosis of the _______ bone
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The _______ is the 3rd most fractured and dislocated bone in the hand
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The _______ ligament forms the Tunnel of Guyon and is associated with the hook of hamate
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Study Notes
Wrist Movements and Anatomy
- Movements of the wrist include abduction, adduction, and positions between flexion and extension.
- Hand structure features the distal transverse arch, proximal transverse arch, and longitudinal arch.
Ligaments and Support
- The ligament connecting the radius, ulna, and metacarpal bones to carpal bones plays a crucial role in wrist stability.
- Ligaments in the hand help prevent the bowstring effect, enhancing functional movement.
Thumb and Tendon Mechanisms
- Full opposition of the thumb defines its functional position, allowing for grip and manipulation.
- The extensor hood mechanism within the hand provides shortcuts for tendons, facilitating quicker movements.
Joint Types and Stability
- The elbow joint consists of a hinge joint providing flexion and extension.
- Bony configurations significantly influence the stability of various joints.
- The pivot joint at the elbow allows for rotation between the radius and ulna.
- A complex network of fibrous tissue stabilizes the elbow joint and maintains structural integrity.
Radial and Ulnar Interaction
- Proximal articulation prevents displacement of the radius and ulna during pushing movements, ensuring coordinated function.
- The annular ligament creates a ring structure, enclosing part of the radius for stability.
Limitations and Force
- The quadrate ligament restricts the spin of the radial head during pronation and supination movements.
- The oblique cord remains taut, particularly during specific arm movements.
Carpal Bone Anatomy
- The 'scaphoid' carpal bone is identifiable by its tubercle, which serves as an attachment for the flexor carpi radialis (FCR) tendon.
- The scaphoid is known as the 2nd most fractured bone in the hand and is part of the proximal carpal row.
Anatomic Snuffbox
- The anatomic snuffbox is delineated by the extensor pollicis longus (EPL) medially, and abductor pollicis longus (APL) and extensor pollicis brevis (EPB) laterally; it is significant in diagnosing fractures of the scaphoid.
Avascular Necrosis Conditions
- Kienbock's Disease involves avascular necrosis specifically affecting the lunate bone.
- Preisser's Disease is associated with avascular necrosis of the capitate bone.
Fractures and Dislocations
- The lunate is noted as the 3rd most fractured and dislocated bone in the hand, often linked to significant trauma.
- The ulnar ligament contributes to the formation of the Tunnel of Guyon, associated with the hook of hamate, relevant in ulnar nerve issues.
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Description
Test your knowledge about the ligaments at the elbow joint including the Medial Collateral Ligament, Lateral Collateral Ligament, Annular Ligament, and Quadrate Ligament. Learn about their shapes, functions, and attachments.
