Intermediate Extensor Carpi Ulnaris Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. Through which dorsal extensor compartment does the tendon of extensor carpi ulnaris pass at the wrist?
- First compartment
- Fourth compartment
- Second compartment
- Sixth compartment
Q2. Which bony landmark is closely related to the extensor carpi ulnaris tendon at the distal forearm?
- Scaphoid tubercle
- Lateral epicondyle only
- Head of the ulna
- Radial tuberosity
Q3. Which structure forms a retaining roof over the extensor carpi ulnaris tendon at the dorsal wrist?
- Flexor retinaculum
- Palmar aponeurosis
- Bicipital aponeurosis
- Extensor retinaculum
Q4. Which spinal nerve roots are commonly associated with the motor supply of extensor carpi ulnaris?
- C3 and C4
- C7 and C8
- T1 and T2 only
- C5 only
Q5. Which muscle can act with extensor carpi ulnaris to produce ulnar deviation while reducing the extension or flexion component?
- Pronator teres
- Flexor carpi ulnaris
- Flexor carpi radialis
- Extensor carpi radialis longus
Q6. Which muscle can act with extensor carpi ulnaris to produce relatively balanced wrist extension with reduced side-to-side deviation?
- Extensor carpi radialis longus
- Palmaris longus
- Pronator quadratus
- Flexor carpi ulnaris
Q7. How can extensor carpi ulnaris function be assessed clinically?
- Resisted wrist extension with ulnar deviation
- Resisted thumb opposition
- Resisted forearm pronation
- Resisted wrist flexion with radial deviation
Q8. Why does extensor carpi ulnaris contribute to wrist stability during forceful gripping?
- It directly opposes the thumb
- It helps counter the wrist flexion produced by the finger flexors
- It directly flexes the distal phalanges
- It prevents all movement of the fingers
Q9. Which feature distinguishes the distal attachment of extensor carpi ulnaris from the radial wrist extensors?
- Insertion on the base of the second metacarpal
- Insertion on the base of the third metacarpal
- Insertion on the base of the fifth metacarpal
- Insertion on the distal phalanx of the thumb
Q10. Which description best explains the line of pull responsible for ulnar deviation by extensor carpi ulnaris?
- It inserts on the radial styloid
- Its tendon crosses the wrist on the radial side
- Its tendon crosses the wrist on the ulnar side
- It inserts on the second metacarpal