Muscles of the Hand

Question 1

What are the two groups of muscles that act on the hand?

Answer 1

Intrinsic

Extrinsic

Question 2

Where are the extrinsic muscles mainly found?

Answer 2

In the forearm

Question 3

What do the extrinsic muscles do?

Answer 3

Offer the forceful grip of the hand

Question 4

Where are the intrinsic muscles found?

Answer 4

Inside the hand

Question 5

What do the intrinsic muscles do?

Answer 5

The finer movements of the hand eg writing

Question 6

What are the muscles of the hand?

Answer 6

Adductor pollicis
Interossei
Thenar
Palmaris brevis
Lumbricals
Hyperthenar muscles

Question 7

Which muscles are responsible for the fine movement of the thumb?

Answer 7

The thenar muscles

Adductor pollicis

Question 8

Which nerve innervates the thenar muscles?

Answer 8

The median nerve

Question 9

What are the 3 thenar muscles?

Answer 9

Oppenens pollicis
Abductor pollicis brevis
Flexor pollicis brevis

Question 10

Which is the largest of the thenar muscles?

Answer 10

Oppenens pollicis. It lies under the other two thenar muscles

Question 11

What is the main action of the oppoenens pollicis?

Answer 11

Opposes the thumb by medially rotating and flexing the metacarpel on the trapezium

Question 12

Where is the abductor pollicis brevis found?

Answer 12

Anteriorly to the oppoenens pollicis

Proximal to flexor pollicis brevis

Question 13

What is the main action of the abductor pollicis brevis?

Answer 13

Abducts the thumb

Question 14

What is the main action of the flexor pollicis brevis?

Answer 14

Flexes the metacarpel-phalangeal joint of the thumb.

Question 15

What are the hypothenar muscles?

Answer 15

Opponens digiti minimi
Abductor digiti minimi
Flexor digiti minimi brevis

Question 16

Where are the hypothenar muscles located?

Answer 16

At the base of the little finger

Medial side of the palm

Question 17

What nerve innervates the hypothenar muscles?

Answer 17

The ulnar nerve

Question 18

Where is the opponens digiti minimi?

Answer 18

Deep to the hypothenar muscles

Question 19

What is the main action of the opponens digiti minimi?

Answer 19

Produces opposition by rotating the metacarpel of the little finger towards the palm

Question 20

Where is the Abductor digiti minimi?

Answer 20

Superificial to the hypothenar muscles

Question 21

What is the main action of Abductor digiti minimi?

Answer 21

Abducts the little finger

Question 22

Where is the flexor digiti minimi brevis?

Answer 22

Lateral to the abductor digiti minimi

Question 23

What is the main action of the flexor digiti minimi brevis?

Answer 23

Flexes the metacarpel-phalangeal joint of the little finger

Question 24

What are the two muscles of the palm which do not fit into the hypothenar group or thenar group?

Answer 24

Adductor pollicis

Palmaris brevis

Question 25

What is special about the Adductor pollicis?

Answer 25

It has two heads with the radial artery passing through them to form the deep palmar arch

Question 26

What is the main action of the Adductor pollicis?

Answer 26

Adduction of the thumb

Question 27

What nerve innervates the Adductor pollicis?

Answer 27

The ulnar nerve

Question 28

Where is the palmaris brevis?

Answer 28

Superficial to the subsutaneous tissue of the hypothenar eminence

Question 29

What is the main action of the palmaris brevis?

Answer 29

Deepens the curvature of the hand to improve grip

Question 30

What nerve innervates the palmaris brevis?

Answer 30

The ulnar nerve

Question 31

How many lumbrical muscles are there?

Answer 31

Four. One associated with each finger.

Question 32

Why are the lumbricals essential for finger movement?

Answer 32

They link the extensor tendons with the flexor tendons

Question 33

What happens with denerveration of the lumbricals?

Answer 33

Ulnar claw | Hand of Benediction

Question 34

What is the main action of the lumbricals?

Answer 34

Flex at the metacarpal-phalangeal joint of the finger | Extend at the inter-phalangeal joint of the finger

Question 35

What innervates the lumbricals?

Answer 35

Medial 2 lumbricals = Ulnar nerve | Lateral 2 lumbricals = Median nerve

Question 36

Where are the interossei muscles?

Answer 36

Between the metacarpals

Question 37

What are the two types of interossei?

Answer 37

Dorsal interossei | Palmar interossei

Question 38

How many dorsal interossei are there?

Answer 38

Four

Question 39

Where are the dorsal interossei located?

Answer 39

Superficially

Question 40

What is the main action of the dorsal interossei?

Answer 40

Abduct the fingers at the metacarpal-phalangeal joint

Question 41

What innervates the dorsal interossei?

Answer 41

The ulnar nerve

Question 42

Where are the Palmar interossei located?

Answer 42

Anteriorly on the hand

Question 43

How many palmar interossei are there?

Answer 43

Three

Question 44

What is the main action of the palmar interossei?

Answer 44

Adducts the finger at the metacapal-phalangeal joint

Question 45

What innervates the palmar interossei muscles?

Answer 45

The ulnar nerve