Intermediate Abductor Pollicis Longus Quiz

Q1. Which muscle accompanies abductor pollicis longus through the first dorsal extensor compartment at the wrist?

• Extensor pollicis longus
• Flexor pollicis longus
• Extensor indicis
• Extensor pollicis brevis

Q2. Through which dorsal extensor compartment does the abductor pollicis longus tendon pass?

• Sixth compartment
• Second compartment
• First compartment
• Third compartment

Q3. Which boundary of the anatomical snuffbox is formed partly by the tendon of abductor pollicis longus?

• Lateral boundary
• Floor
• Proximal boundary only
• Medial boundary

Q4. Which tendon forms the medial boundary of the anatomical snuffbox, opposite the abductor pollicis longus and extensor pollicis brevis tendons?

• Flexor carpi radialis
• Flexor pollicis longus
• Extensor pollicis longus
• Extensor carpi ulnaris

Q5. Which spinal nerve roots are commonly associated with the innervation of abductor pollicis longus?

• C5 only
• C7 and C8
• T1 and T2 only
• C3 and C4

Q6. At which joint does abductor pollicis longus primarily produce thumb abduction?

• Elbow joint
• Distal radioulnar joint
• Thumb interphalangeal joint
• First carpometacarpal joint

Q7. Which statement best distinguishes abductor pollicis longus from abductor pollicis brevis?

• Abductor pollicis longus is an extrinsic forearm muscle
• Abductor pollicis longus is supplied by the recurrent median nerve
• Abductor pollicis longus inserts on the proximal phalanx as its primary attachment
• Abductor pollicis longus is confined entirely to the thenar eminence

Q8. How can abductor pollicis longus assist movement of the wrist?

• It is a primary ulnar deviator
• It cannot influence the wrist
• It produces isolated wrist flexion only
• It can assist radial deviation

Q9. Which structure overlies the tendons of abductor pollicis longus and extensor pollicis brevis at the wrist?

• Palmar aponeurosis
• Extensor retinaculum
• Bicipital aponeurosis
• Flexor retinaculum

Q10. How can the action of abductor pollicis longus be assessed clinically?

• Ask for thumb interphalangeal flexion against resistance
• Ask for elbow extension against resistance
• Ask for finger adduction against resistance
• Ask for thumb abduction at the carpometacarpal joint against resistance