The hand

Question 1

What compartments are the intrinsic muscles of the hand split into?

Answer 1

Thenar compartment Hypothenar compartment Adductor compartment Central compartment Interosseus compartment

Question 2

What does the thenar compartment form and what is its main function?

Answer 2

Forms the thenar eminence Main function is apposition of the thumb

Question 3

What muscles make up the thenar eminence/compartment?

Answer 3

Abductor policis brevis Flexor pollicis brevis Opponens pollicis

Question 4

Identify structures labelled 1-3

Answer 4

1- Flexor pollicis brevis 2- Abductor pollicis brevis 3- Opponens pollicis

Question 5

What nerve innervates the thenar muscles?

Answer 5

The median nerve

Question 6

What do the hypothenar muscles produce?

Answer 6

The hypothenar eminence on the medial side of the hand

Question 7

What are the hypothenar muscles?

Answer 7

Abductor digiti minimi

Flexor digiti minimi

Opponens digiti minimi

Question 8

Which nerve innervates all the hypothenar muscles?

Answer 8

The ulnar nerve

Question 9

Identify the structures labelled 1-3 HYPOTHENAR MUSCLES

Answer 9

1- Flexor digiti minimi 2- Abductor digiti minimi 3- Opponens digiti minimi

Question 10

Identify the two heads of adductor pollicis labelled 1 and 2 ADDUCTOR POLLICIS

Answer 10

1- Transverse head 2- Oblique head

Question 11

What is the innervation of adductor pollicis?

Answer 11

The ulnar nerve

Question 12

What is the action of adductor pollicis?

Answer 12

Adducts the thumb

Question 13

From which tendon do the four lumbricals originate?

Answer 13

The tendon of the flexor digitorum profundus

Question 14

What is the action of the lumbricals?

Answer 14

The lumbricals flex the fingers at the metacarpophalangeal joint and simultaneously extends the interphalangeal joint of digits 2-5

Question 15

What is the innervation of the lumbricals?

Answer 15

The medial two lumbricals are innervated by the ulnar nerve and the lateral two the median nerve

Question 16

On which surface of the hand do the lumbricals lie?

Answer 16

On the palmar surface of the bones

Question 17

What is the function of the dorsal interossei?

Answer 17

Dorsal interossei ABduct the fingers (DAB)

Question 18

What is the function of the palmar interossei?

Answer 18

Palmar interossei ADduct the fingers (PAD)

Question 19

Which nerve innervates both the dorsal and palmar interossei?

Answer 19

The ulnar nerve

Question 20

Identify the muscle groups labelled as either lumbricals, palmar interossei or dorsal interossei

Answer 20

1- Lumbricals 2- Dorsal interossei 3- Palmar interossei

Question 21

Through which arteries is all the blood to the hand supplied?

Answer 21

The ulnar and radial arteries and all their branches

Question 22

How is collateral circulation provided to the hand?

Answer 22

Through the superficial and deep palmar arches that are formed from the ulnar and radial arteries

Question 23

Which artery is the main contributor for each palmar arch?

Answer 23

Superficial palmar arch- ulnar artery Deep palmar arch- radial artery

Question 24

Where in the hand does the radial nerve supply?

Answer 24

Supplies the skin on the dorsal aspect of the hand

Question 25

Through what structure does the median nerve enter the hand?

Answer 25

The carpal tunnel

Question 26

What intrinsic muscles of the hand are supplied by the ulnar nerve?

Answer 26

All except the thenar eminence and the first and second lumbricals

Question 27

Identify the dermatomes of the hand labelled 1 and 2 DERMATOMES OF HAND

Answer 27

1- Median nerve 2- Ulnar nerve

Question 28

Identify the dermatomes of the hand labelled 1, 2 and 3

Answer 28

1- Ulnar nerve 2- Radial nerve 3- Median nerve