Wrist and Hand Anatomy Quiz

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Questions and Answers

What is the origin point of the extensor pollicis longus muscle?

  • Proximal half of the radius
  • Posterior surface of the distal third of the radius (correct)
  • Proximal and superior part of the lunate bone
  • Medial aspect of the proximal phalanx of the thumb

What structure does the scaphoid ligament insert into?

  • Articular surface between the scaphoid and lunate bones (correct)
  • Medial aspect of the distal radius
  • Base of the distal phalanx of the thumb
  • Most proximal and superior part of the lunate bone

Which muscle originates on the proximal half of the radius?

  • Abductor pollicis longus (correct)
  • Extensor pollicis longus
  • Flexor carpi radialis
  • Adductor pollicis

What is the sensitivity of a carpal tunnel test according to the findings?

<p>75% (C)</p> Signup and view all the answers

Which limitation is associated with the carpal tunnel test?

<p>Inability to distinguish carpal tunnel syndrome from other conditions (D)</p> Signup and view all the answers

What is the primary purpose of the Finklestein Test?

<p>Tests for de Quervain's disease (C)</p> Signup and view all the answers

What is the sensitivity percentage of the Scaphoid Shift Test?

<p>78% (D)</p> Signup and view all the answers

Which group of individuals is specifically focused on in the Finklestein Test?

<p>New mothers and individuals over 40 (B)</p> Signup and view all the answers

What is a limitation of the Scaphoid Shift Test?

<p>Lower grade lesions may not result in a positive test (C)</p> Signup and view all the answers

What demographic does the Phalen Test primarily focus on?

<p>Men and women aged 65-74 (B)</p> Signup and view all the answers

Flashcards

Scaphoid Ligament

A ligament connecting the scaphoid and lunate bones, located on the most proximal and superior part of the articular surface.

Extensor Pollicis Longus

Muscle that originates on the posterior surface of the distal third of the radius and inserts on the base of the proximal phalanx of the thumb.

Abductor Pollicis Longus

Muscle that originates on the proximal half of the radius and inserts on the medial aspect of the proximal phalanx of the thumb.

Carpal Tunnel Test

A test used to diagnose carpal tunnel syndrome by applying pressure to the median nerve.

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Sensitivity of the Carpal Tunnel Test

The proportion of people with carpal tunnel syndrome who test positive on the carpal tunnel test.

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Finklestein Test

A test used to diagnose de Quervain's disease, focusing on females (especially new mothers) and individuals over 40, as well as non-white individuals.

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Scaphoid Shift Test

A test used to evaluate scaphoidunate interosseous ligament instability, focusing on patients with wrist pain, with a larger focus on females, between 16-68 years of age.

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Phalen Test

A test used to identify carpal tunnel syndrome, evaluating patients with risk factors, those with repetitive hand movements, and individuals aged 65-74.

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Sensitivity

A test's ability to identify individuals with a disease.

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Specificity

A test's ability to correctly identify individuals without a disease

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Study Notes

Wrist and Hand Anatomy

  • The extensor pollicis longus originates on the posterior surface of the distal third of the radius and inserts at the base of the proximal phalanx of the thumb.
  • The abductor pollicis longus originates on the proximal half of the radius and inserts at the medial aspect of the proximal phalanx of the thumb.
  • The scaphoumate ligament inserts into the most proximal and superior part of the articular surface between the scaphoid and the lunate bones.

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