Quiz 17

Question 1

Extensor pollicis brevis

Answer 1

Origin:
- Posterior surface of radius (below abd poll longus)
- Interosseous membrane
Insertion:
- Base of proximal phalanx of thumb
Action:
- Extends the proximal phalanx and 1st metacarpal of the thumb
- Radially deviates the wrist
Nerve:
- Radial 
- C6,7,8

Question 2

Abductor pollicis longus

Answer 2

Origin:
- Posterior surface of ulna and radius
- Interosseous membrane
Insertion:
- Lateral aspect of base of 1st metacarpal 
Action:
- Abducts the 1st metacarpal
- Radially deviates the wrist
- Assists to extend & rotate the thumb
- Flexes the wrist 
Nerve:
- Radial 
- C6,7,8

Question 3

Abductor digiti minimi

Answer 3

Origin:
- Pisiform and tendon of flexor carpi ulnaris 
Insertion:
- Medial base of proximal phalanx of 5th finger 
Action:
- Abducts the 5th digit
- Assists to flex the 5th digit 
Nerve:
- Ulnar  
- C8, T1

Question 4

Flexor digiti minimi brevis

Answer 4

Origin:
- Hamulus of hamate and transverse carpal ligament 
Insertion:
- Ulnar side of base of proximal phalanx of 5th finger 
Action:
- Flexes the 5th digit 
Nerve:
- Ulnar  
- C8, T1

Question 5

Opponens digiti minimi

Answer 5

Origin:
- Hamulus of hamate and flexor retinaculum 
Insertion:
- Ulnar side of 5th metacarpal 
Action:
- Opposes 5th digit with the thumb
- Assists to “cup the palm” 
Nerve:
- Ulnar  
- C8, T1