Intrinsic Mucscles of the Hand

Question 1

What are the three parts of the hand?

Answer 1

1. the wrist (carpus) 2. hand proper (metacarpus) 3. fingers (digits)

Question 2

The anterior surface of the hand is called what?

Answer 2

the palm

Question 3

What posterior surface of the hand is called what?

Answer 3

dorsum

Question 4

What is the axis of the hand?

Answer 4

the third metacarpal (middle finger)

Question 5

ADDuction and ABduction of fingers is in relation to what?

Answer 5

the axis (middle finger) of the hand

Question 6

What are the movements of the axis of the hand?

Answer 6

ABduction to the right and left (no adduction because it is the axis)

Question 7

What is different about the first digit (thumb) compared to digits 2-5?

Answer 7

2 phalanges, has 90 degree medial rotation

Question 8

What digit is at a right angle to the other digits?

Answer 8

first

Question 9

What are the movements of the thumb? At what joint?

Answer 9

AB/ADD, flex/ext/opposition, reposition @ carpometacarpal joints

Question 10

What is the carpal arch?

Answer 10

formed by carpal bones, directed anteriorly

Question 11

How is the carpal tunnel formed?

Answer 11

carpal arch being converted to carpal tunnel by the attachment of the flexor retinaculum

Question 12

What passes through the carpal tunnel?

Answer 12

9 tendons and median nerve

Question 13

What are the 9 tendons that pass through the carpal tunnel?

Answer 13

x4 from flexor digitortorum superficialis
x4 from flexor digitorum profundus
x1 from flexor pollicis longus

Question 14

What is an extrinsic muscle?

Answer 14

origin and insertion are not in the same region

Question 15

What is an intrinsic muscle?

Answer 15

origin and insertion are in the same region

Question 16

What are the groups of intrinsic muscles of the hand?

Answer 16

Thenar Eminence, Hypothenar Eminence, Central

Question 17

What is the thenar eminence?

Answer 17

intrinsic muscles of the hand that move the thumb.

Question 18

What muscles are part of the thenar eminence?

Answer 18

abductor pollicis brevis, flexor pollicis brevis, opponens pollicis

Question 19

What is the deepest muscle of the thenar eminence

Answer 19

opponens pollicis

Question 20

What is the hypothenar eminence

Answer 20

intrinsic muscles of the hand that move the 5th digit

Question 21

What muscles are included in the hypothenar eminance?

Answer 21

palmaris brevis, abductor digiti minimi, flexor digiti minimi, opponens digiti minimi

Question 22

What muscles are included in the central group of the hand?

Answer 22

lumbricals (4), dorsal interosseous (4), palmar interosseous (3), adductor pollicis

Question 23

Which of the follow muscles does NOT belong to the thenar eminence? What group does it actually belong to?:
Abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, opponens pollicis

Answer 23

Adductor Pollicis belongs to central group

Question 24

All intrinsic muscles of the hand are innervated by which nerve(s)?

Answer 24

medial and/or ulnar

Question 25

Lumbrical muscles are innervated by which nerve(s)

Answer 25

median and/or ulnar

Question 26

The thenar eminence is innervated by which nerve(s)

Answer 26

median nerve

Question 27

The hypothenar eminence is innervated by which nerve(s)

Answer 27

ulnar nerve

Question 28

What is the origin of the abductor pollicis brevis?

Answer 28

flexor retinaculum and scaphoid + trapezium

Question 29

What is the insertion of the abductor pollicis brevis

Answer 29

proximal phalanx of the first digit (thumb)

Question 30

What are the functions of the abductor pollicis brevis?

Answer 30

abduction of the thumb @ CMC + MCP

Question 31

What is the innervation of the abductor pollicis brevis

Answer 31

median nerve

Question 32

What muscle group is the abductor pollicis brevis part of

Answer 32

Thenar Eminence

Question 33

What is the origin of the flexor pollicis brevis?

Answer 33

flexor retinaculum and trapezium

Question 34

What is the insertion of the flexor pollicis brevis?

Answer 34

proximal phalanx of first digit (thumb)

Question 35

What are the functions of the flexor pollicis brevis

Answer 35

flexion of first digit (thumb) @ CMC + MCP

Question 36

What is the innervation of the flexor pollicis brevis?

Answer 36

median (and ulnar)

Question 37

What muscle group does the flexor pollicis brevis belong to?

Answer 37

thenar eminence

Question 38

What is the origin of the abductor digiti minimi

Answer 38

pisiform and tendon of FCU

Question 39

What is the insertion of the abductor digiti minimi?

Answer 39

proximal phalanx of 5th finger

Question 40

What are the functions of the abductor digiti minimi?

Answer 40

abduction of the 5th digit @ CMC and MCP

Question 41

What is the innervation of the abductor digiti minimi?

Answer 41

ulnar nerve

Question 42

What muscle group does the abductor digiti minimi belong to?

Answer 42

Hypothenar eminence

Question 43

What is the origin of the flexor digiti minimi brevis manus?

Answer 43

flexor retinaculum and hook of hamete

Question 44

What is the insertion of the flexor digiti minimi brevis manus?

Answer 44

proximal phalanx of 5th digit

Question 45

What are the functions of the flexor digiti minimi brevis manus?

Answer 45

flexion of the 5th digit @ CMC + MCP

Question 46

What is the innervation of the flexor digiti minimi brevis manus?

Answer 46

ulnar nerve

Question 47

What muscle group does the flexor digiti minimi brevis manus belong to?

Answer 47

hypothenar eminence

Question 48

What group of interosseous muscles is ‘not real’ interosseous muscles?

Answer 48

palmar interosseous

Question 49

What group of interosseous muscles are ‘real’ interosseous muscles? Why?

Answer 49

dorsal interossi muscles, they are truly inbetween metacarpal bones

Question 50

Generally what is the origin of the palmar interossei muscles?

Answer 50

anterior side of metacarpals of fingers #2,4,5

Question 51

What is the origin of the palmar interosseous #1?

Answer 51

metacarpal #2

Question 52

What is the origin of the palmar interosseous #2

Answer 52

metacarpal #4

Question 53

What is the origin of palmar interosseous #3

Answer 53

metacarpal #5

Question 54

Generally what is the insertion of the palmar interossei muscles?

Answer 54

base of proximal phalanges and extensor hoods of fingers 2,4,5

Question 55

What is the insertion of palmar interoseous #1?

Answer 55

to index (#2)

Question 56

What is the insertion of the palmar interosseous #2?

Answer 56

to lateral ring finger (#4)

Question 57

What is the insertion of palmar interosseous #3?

Answer 57

to pinkie (#5)

Question 58

What are the functions of the palmar interossei muscles?

Answer 58

ADDuction of fingers 2,4,5 @ MCP, Flexion of fingers 2,4,5 @ MCP Extension of fingers 2,4,5 @ PIP+DIP

Question 59

What nerve innervates the palmar interossei muscles

Answer 59

ulnar nerve

Question 60

What is the origin of the dorsal interossi muscles?

Answer 60

adjacent sides of metacarpals

Question 61

Generally what is the insertions of the dorsal interossi muscles?

Answer 61

base of proximal phalanges and extensor hoods of fingers 2,3,4

Question 62

What is the insertion of dorsal interosseous #1?

Answer 62

lateral side of index (#2)

Question 63

What is the insertion of dorsal interosseous #2?

Answer 63

lateral side of middle (#3)

Question 64

What is the insertion of dorsal interosseous #3?

Answer 64

medial side of middle (3)

Question 65

What is the insertion of dorsal interosseous #4?

Answer 65

medial side of ring (#4)

Question 66

What are the functions of the dorsal interossi muscles?

Answer 66

Abduction of fingers 2,3,4 @ MCP, Flexion of fingers 2,3,4 @MCP, Extension of fingers 2,3,4 @ PIP+DIP

Question 67

What is the innervation of the dorsal interossi muscles?

Answer 67

ulnar nerve