Hand Muscles Quiz
Questions: 16 · 10 minutes
1. To hold a sheet of paper firmly between two adjacent fingers without using the thumb, which muscles primarily adduct the fingers?
Dorsal interossei
Palmar interossei
Flexor digitorum superficialis
Extensor digitorum
2. Which hypothenar muscle moves the little finger away from the ring finger at the metacarpophalangeal joint?
Opponens digiti minimi
Flexor digiti minimi brevis
Abductor digiti minimi
Palmar interosseous of the little finger
3. Which pair can work together to produce radial deviation while their opposing flexion and extension effects help balance each other?
Flexor carpi ulnaris and extensor carpi ulnaris
Palmaris longus and flexor digitorum superficialis
Flexor carpi radialis and extensor carpi radialis longus
Extensor digitorum and flexor digitorum profundus
4. When the thumb is extended, which tendon arrangement forms the main borders of the anatomical snuffbox?
Abductor pollicis longus and extensor pollicis brevis laterally, with extensor pollicis longus medially
Extensor carpi radialis longus laterally and extensor carpi ulnaris medially
Flexor carpi radialis laterally and palmaris longus medially
Flexor pollicis longus laterally and adductor pollicis medially
5. Which statement correctly distinguishes the palmar and dorsal interossei?
Palmar interossei extend the wrist, while dorsal interossei flex it
Palmar interossei adduct the fingers, while dorsal interossei abduct them
Palmar interossei oppose the thumb, while dorsal interossei extend it
Palmar interossei flex distal finger joints, while dorsal interossei extend them
6. To assess palmar abduction of the thumb, a person lifts the thumb perpendicular to the plane of the palm against resistance. Which muscle is chiefly being tested?
Abductor pollicis brevis
Adductor pollicis
Extensor pollicis longus
First dorsal interosseous
7. An examiner holds a finger's middle phalanx straight and asks the person to bend only the distal interphalangeal joint. Which muscle is being emphasized?
Flexor digitorum profundus
Flexor digitorum superficialis
Extensor digitorum
A lumbrical
8. A person spreads the index, middle, ring, and little fingers apart against resistance. Which muscle group supplies the main force?
Palmar interossei
Dorsal interossei
Thenar muscles
Lumbricals
9. A lesion affecting the deep branch of the ulnar nerve makes it difficult to spread the fingers. Which listed muscles are most directly affected?
Extensor digitorum muscles
Dorsal interossei
Thenar muscles supplied by the median nerve
Flexor digitorum superficialis tendons
10. What combined movement is characteristically produced by the lumbricals at the finger joints?
Extension at both the metacarpophalangeal and interphalangeal joints
Flexion at both the metacarpophalangeal and interphalangeal joints
Extension at the metacarpophalangeal joints with flexion at the interphalangeal joints
Flexion at the metacarpophalangeal joints with extension at the interphalangeal joints
11. During a resisted test, a person extends the wrist while moving it toward the thumb side. Which muscle is especially suited to this combined action?
Extensor carpi ulnaris
Flexor carpi ulnaris
Extensor carpi radialis longus
Palmaris longus
12. Which thenar muscle draws the first metacarpal across the palm to help the thumb face the fingertips?
Extensor pollicis brevis
Adductor pollicis
Opponens pollicis
Abductor pollicis longus
13. Where does extensor carpi radialis longus insert?
Distal phalanx of the thumb
Base of the fifth metacarpal
Pisiform
Base of the second metacarpal
14. Damage to the recurrent branch of the median nerve would most directly weaken which thumb movement and prime mover?
Thumb adduction by adductor pollicis
Thumb flexion at the interphalangeal joint by flexor pollicis longus
Thumb extension by extensor pollicis longus
Thumb opposition by opponens pollicis
15. A person can extend all four fingers together but struggles to extend the index finger independently. Which muscle is most specifically associated with the missing action?
Extensor digiti minimi
First dorsal interosseous
Flexor digitorum profundus
Extensor indicis
16. Which muscle is classified as intrinsic because its muscle belly lies within the hand?
First dorsal interosseous
Flexor digitorum superficialis
Extensor pollicis longus
Extensor carpi radialis longus