Hand muscles

Question 1

Name 3 thenar muscles from most superficial to deep

Innervation of thenar muscles and state segmental values

Answer 1

APB
FPB
Opponens pollicis

Median nerve C5 T1`

Question 2

Name 3 hypothenar muscles

Innervation and state segmental values

Answer 2

Abductor digiti minimi
Flexor digiti minimi
Opponens digiti minimi

Ulnar nerve C8 T1

Question 3

2 heads of adductor pollicis

Innervation

Answer 3

Transverse and oblique head

Ulnar nerve

Question 4

Lumbricals
Origin
Action [2]
Innervation

Answer 4

Origin - tendon of FDP
Action [2] - MCP flexion, ITP extension 2-5
Innervation - medial 2 lumbricals innervated by ulnar nerve, lateral 2 lumbricals innervated by median nerve

Question 5

Palmar vs dorsal interossei - which can be seen clearly on specimen

Answer 5

Dorsal interossei

Palmar interossei are too deep

Question 6

Lesion of which trunk of brachial plexus results in paralysis of lumbricals

Answer 6

Lower trunk, Klumpke’s paralysis

Question 7

Which artery is main contributor of superficial and deep palmar arch

Answer 7

Ulnar artery for superficial palmar arch

Radial artery for deep palmar arch

Question 8

radial nerve supply in hand

Answer 8

Doesn’t supply any hand muscles but supplies skin on dorsal aspect of hand

Question 9

Anatomical snuffbox
2 wrist bones
floor of artery - which artery

Answer 9

Scaphoid
Trapezium
Radial artery makes up floor of snuffbox

Question 10

Wrist drop
Injury
Damage to
Why

Answer 10

Midshaft humeral fracture
Radial nerve damage so damage to posterior arm and forearm muscles
Because radial nerves presence in radial groove

Question 11

Surgical neck of humerus results in damage to what

Answer 11

Axillary nerve

Question 12

Damage to upper trunk
Damage to…
Which muscles are affected?
Clinical sign?

Answer 12

Damage to muscles supplied by C5-C6 eg supinator, deltoid, BBC, wrist extensors
Erb’s palsy ie waiter’s tip - medial rotation of shoulder and wrist in flexion
Undue separation of head from shoulder