Muscles of the Hand

Question 1

Where are the extrinsic muscles of the hand

Answer 1

Anterior and posterior compartments of the forearm

Question 2

What is the action of extrinsic muscles of the hand

Answer 2

Control crude movements and produce a forceful grip

Question 3

Where are the intrinsic muscles of the hand

Answer 3

Within the hand itself

Question 4

What do the intrinsic muscles of the hand do

Answer 4

Responsible for fine motor function of the hand

Question 5

What are the intrinsic muscles of the hand

Answer 5

Adductor pollicis
Palmaris brevis
Interossei
Lumbricals
Thenar muscles
Hypothenar muscles

Question 6

Which muscles make up the thenar muscles

Answer 6

Opponens pollicis
Abductor pollicis brevis
Flexor pollicis brevis

Question 7

Which nerve innervates the thenar muscles

Answer 7

Median nerve

Question 8

Which is the largest of the thenar muscles

Answer 8

Opponens pollicis

Question 9

Where does opponens pollicis lie

Answer 9

Beneath abductor pollicis brevis and flexor pollicis brevis

Question 10

Where does opponens pollicis originate

Answer 10

Tubercle of trapezium

Associated flexor retinaculum

Question 11

Where does opponens pollicis insert

Answer 11

Lateral margin of the metacarpal of the thumb

Question 12

What is the action of opponens pollicis

Answer 12

Opposes the thumb

Medially rotating and flexing metacarpal on trapezium

Question 13

Which nerve innervates opponens pollicis

Answer 13

Median nerve

Question 14

Where is abductor pollicis brevis

Answer 14

Anterior to opponens pollicis

Proximal to flexor pollicis brevis

Question 15

Where does abductor pollicis brevis originate

Answer 15

Tubercles of scaphoid and trapezium

Associated flexor retinaculum

Question 16

Where does abductor pollicis brevis insert

Answer 16

Lateral side of proximal phalanx of the thumb

Question 17

What is the action of abductor pollicis brevis

Answer 17

Abducts the thumb

Question 18

Which nerve innervates abductor pollicis brevis

Answer 18

Median nerve

Question 19

Which is the most distal of the thenar muscles

Answer 19

Flexor pollicis brevis

Question 20

Where does flexor pollicis brevis originate

Answer 20

Tubercle of the trapezium

Associated flexor retinaculum

Question 21

Where does flexor pollicis brevis insert

Answer 21

Base of the proximal phalanx of the thumb

Question 22

What is the action of flexor pollicis brevis

Answer 22

Flexes MCPJ of the thumb

Question 23

Which nerve innervates flexor pollicis brevis

Answer 23

Median nerve

Deep head is innervated by the deep branch of the ulnar nerve

Question 24

Which are the hypothenar muscles

Answer 24

Opponens digiti minimi
Abductor digiti minimi
Flexor digiti minimi brevis

Question 25

Which nerve innervates the hypothenar muscles

Answer 25

Ulnar nerve

Question 26

Which hypothenar muscles lies deepest

Answer 26

Opponens digiti minimi

Question 27

Where does opponens digiti minimi originate

Answer 27

Hook of hamate | Associated flexor retinaculum

Question 28

Where does opponens digiti minimi insert

Answer 28

Medial margin of metacarpal V

Question 29

What is the action of opponens digiti minimi

Answer 29

Rotates metacarpal of little finger towards the palm

Question 30

Which nerve innervates opponens digiti minimi

Answer 30

Ulnar nerve

Question 31

Which is the most superficial of the hypothenar muscles

Answer 31

Abductor digiti minimi

Question 32

Where does abductor digiti minimi originate

Answer 32

Pisiform | Tendon of flexor carpi ulnaris

Question 33

Where does abductor digiti minimi insert

Answer 33

Base of the proximal phalanx of the little finger

Question 34

What is the action of abductor digiti minimi

Answer 34

Abducts the little finger

Question 35

Which nerve innervates abductor digiti minimi

Answer 35

Ulnar nerve

Question 36

Where does flexor digiti minimi brevis lie

Answer 36

Laterally to abductor digiti minimi

Question 37

Where does flexor digiti minimi brevis originate

Answer 37

Hook of hamate | Adjacent flexor retinaculum

Question 38

Where does flexor digiti minimi brevis insert

Answer 38

Base of the proximal phalanx of the little finger

Question 39

What is the action of flexor digiti minimi brevis

Answer 39

Flexes MCP joint of the little finger

Question 40

Which nerve innervates flexor digiti minimi brevis

Answer 40

Ulnar nerve

Question 41

How many lumbricals are there in each hand

Answer 41

4 - link extensor tendons to flexor tendons

Question 42

Where do the lumbricals originate

Answer 42

Each lumbrical originates from a tendon of the flexor digitorum profundus

Question 43

Where do the lumbricals insert

Answer 43

Pass dorsally and laterally around each finger and inserts into extensor hood

Question 44

What is the action of the lumbricals

Answer 44

Flex at the MCP joint | Extend at the interphalangeal joints

Question 45

Which nerve innervates the lateral two lumbricals

Answer 45

Median nerve

Question 46

Which nerve innervates the medial two lumbricals

Answer 46

Ulnar nerve

Question 47

How many dorsal interossei muscles are there

Answer 47

4

Question 48

Where do the dorsal interossei originate

Answer 48

Each interossei originates from the lateral and medial surfaces of the metacarpals

Question 49

Where do the dorsal interossei insert

Answer 49

Extensor hood and proximal phalanx of each finger

Question 50

What is the action of the dorsal interossei

Answer 50

Abduct the fingers at MCPJ

Question 51

Which nerve innervates dorsal interossei

Answer 51

Ulnar nerve

Question 52

Where do palmar interossei lie

Answer 52

Anteriorly

Question 53

How many palmar interossei are there

Answer 53

3

Question 54

Where do palmar interossei originate

Answer 54

Each interossei originates from a medial or lateral surface of a metacarpal

Question 55

Where do palmar interossei insert

Answer 55

Extensor hood | Proximal phalanx of same finger

Question 56

What is the action of palmar interossei

Answer 56

Adducts fingers at MCPJ

Question 57

Which nerve innervates palmar interossei

Answer 57

Ulnar nerve

Question 58

Where is palmaris brevis

Answer 58

Found superficially in subcutaneous tissue of hypothenar eminence

Question 59

Where does palmaris brevis originate

Answer 59

Palmar aponeurosis | Flexor retinaculum

Question 60

Where does palmaris brevis insert

Answer 60

Dermis of the skin on medial margin of hand

Question 61

What is the action of palmaris brevis

Answer 61

Wrinkles skin of hypothenar eminence | Deepens curvature of hand, improving grip

Question 62

Which nerve innervates palmaris brevis

Answer 62

Ulnar nerve

Question 63

What passes between the two heads of adductor pollicis

Answer 63

Radial artery

Question 64

Where does adductor pollicis originate

Answer 64

Two heads:- Metacarpal III Capitate and adjacent areas of metacarpals II and III

Question 65

Where does adductor pollicis insert

Answer 65

Base of proximal phalanx of the thumb

Question 66

What is the action of adductor pollicis

Answer 66

Adduction of the thumb

Question 67

Which nerve innervates adductor pollicis

Answer 67

Ulnar nerve