Upper Limb Anatomy and Injuries Quiz

Carpal Tunnel Anatomy

• The carpal tunnel is formed by the extensor retinaculum.
• The largest carpal bone is the hamate.
• The scaphoid is the first carpal bone to ossify at 3 years of age.
• The primary blood supply to the scaphoid is through the palmar branch of the radial artery.

Wrist Joint Functionality

• The flexor retinaculum prevents 'bow stringing' of tendons during wrist flexion.
• The articular capsule of the wrist joint is thick and tight.

Injuries and Conditions

• Carpal tunnel syndrome can lead to paraesthesia, numbness, and motor weakness of thumb muscles due to compression of the ulnar nerve.
• Pulled elbow, also known as subluxation, is a common injury in preschool children aged 1-3 years.

Joint Classification

• The carpometacarpal joint of the thumb is classified as a hinge type of synovial joint.

Miscellaneous

• Inflammation of the synovial sheath is not painful because the synovial space remains empty.
• The ligament that runs from the styloid process of ulna to triquetral is called the radial collateral ligament.