Muscles Of The Hand

Question 0

Name the thenar muscles

Answer 0

Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis

Question 1

What are the thenar muscles mostly responsible for?

Answer 1

Opposition of the thumb

Question 2

Which nerves innervate the thenar muscles?

Answer 2

Median

Question 3

What does the flexor pollicis brevis do? (Of the thenar muscles)

Answer 3

Flexes MCP joint of the thumb

Question 4

What does the abductor pollicis brevis do? (Of the thenar muscles)

Answer 4

Abducts the thumb

Question 5

Action of the opponens pollicis? (Thenar muscle)

Answer 5

Opposes the thumb

Question 6

Name the hypothenar muscles

Answer 6

Opponens digiti minimi
Abductor digiti minimi
Flexor digiti minimi brevis

Question 7

What are the hypothenar muscles innervated by?

Answer 7

The ulnar nerve

Question 8

Action of the opponens digiti minimi? (Hypothenar muscle)

Answer 8

Opposes the little finger

Question 9

Action of the abductor digiti minimi?

Answer 9

Abducts the little finger

Question 10

Action of the flexor digiti minimi brevis? (Hypothenar)

Answer 10

Flexes the MCP joint of little finger

Question 11

Where is the palmaris brevis?

Answer 11

Subcutaneous tissue of the hypothenar eminence.

Question 12

What is the palmaris brevis innervated by?

Answer 12

The ulnar nerve

Question 13

Action of the palmaris brevis?

Answer 13

Wrinkles skin of hypothenar eninenence

Deepens hollow of the palm - aiding palmar grip

Question 14

Action of the lumbricals?

Answer 14

Flex the fingers at the metacarpophalangeal joints and extend the interphalangeal joints

Question 15

Innervation of the lumbricals?

Answer 15

1st and 2nd - median nerve

3rd and 4th - ulnar nerve

Question 16

Action of the dorsal interossei?

Answer 16

Abduct 2nd - 4th digits (DAB)

With the lumbricals, flex metacarpophalangeal joints and extend interphalangeal joints

Question 17

Action of the palmar interossei?

Answer 17

Adduct 2nd, 4th and 5th digits (PAD)

Assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints.

Question 18

Innervation of the interossei?

Answer 18

Ulnar

Question 19

Innervation of the adductor pollicis?

Answer 19

Ulnar nerve

Question 20

Action of the adductor pollicis?

Answer 20

Adducts the thumb

Question 21

What passes between the two heads of the adductor pollicis?

Answer 21

The radial nerve. Forms the deep palmar arch

Question 22

What is the hand of Benediction a result of?

Answer 22

Damage to the median nerve.

Question 23

Which muscle are paralysed in the hand of benediction?

Answer 23

All the flexors in the anterior compartment of the forearm except for the medial half of the flexor digitorum profundus and the flexor carpi ulnaris
Lateral two lumbricals of the middle and index fingers

Question 24

What happens in a hand of benediction?

Answer 24

The patient tries to make a fist. Can only flex medial two fingers.

Question 25

Which muscles are paralysed in the ulnar claw?

Answer 25

Medial two lumbricals
Interossei
Hypothenar muscles
Adductor pollicis

Medial half of flexor digitorum profundus
Flexor carpi ulnaris

Question 26

What is seen in ulnar claw?

Answer 26

MCP joints of little and ring finger are hyperextended by unopposed extension of extensor digitorum
IP joints of little and ring finger are flexed by unopposed flexion from flexor digitorum profundus