Hand Muscles

Question 1

Origin of Oppennes pollicis

Answer 1

• Scaphoid tubercle

- Trapezium tubercle

Question 2

Insertion of Oppennes pollicis

Answer 2

Lateral side of 1st metacarpal

Question 3

What does the Oppennes pollicis do?

Answer 3

Opposes thumb

Question 4

What innervates the Oppennes pollicis?

Answer 4

Median Nerve

Question 5

Origin of Abductor Pollicis Brevis

Answer 5

• Scaphoid Tubercle

- Trapezium Tubercle

Question 6

Insertion of abductor Pollicis Brevis

Answer 6

Lateral side of base of proximal phalanx of thumb

Question 7

What does the abductor Pollicis Brevis do?

Answer 7

Abducts thumb

Question 8

What innervates the abductor pollicis brevis

Answer 8

Median Nerve

Question 9

Origin of the flexor pollicis brevis

Answer 9

• Scaphoid Tubercle

- Trapezium Tubercle

Question 10

Insertion of the flexor pollicis brevis

Answer 10

Lateral side of base of proximal phalanx of thumb

Question 11

What does the flexor pollicis brevis do?

Answer 11

flexes the thumb

Question 12

What innervates the flexor pollicis brevis?

Answer 12

Ulnar Nerve

Question 13

Origin of the adductor pollicis

Answer 13

bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals
anterior surface of body of 3rd metacarpal

Question 14

Insertion of the adductor pollicis

Answer 14

Medial side of base of proximal phalanx of thumb

Question 15

What does the adductor pollicis do?

Answer 15

Adducts thumb toward lateral border of palm

Question 16

What innervates the adductor pollicis?

Answer 16

Ulnar Nerve

Question 17

Origin of the abductor digiti minimi

Answer 17

Pisiform

Question 18

insertion of the abductor digiti minimi

Answer 18

Medial side of base of proximal phalanx of little finger

Question 19

What does the abductor digiti minimi do?

Answer 19

Abducts pinky

Question 20

What is the abductor digiti minimi innervated by?

Answer 20

Ulnar Nerve

Question 21

Origin of the flexor digiti minimi

Answer 21

• Hook of Hamate

- Flexor Retinaculum

Question 22

Insertion of the flexor digiti minimi

Answer 22

Medial side of base of proximal phalanx of little finger

Question 23

What does the flexor digiti minimi do?

Answer 23

Flexes proximal phalanx of little (5th) finger

Question 24

What innervates the flexor digiti minimi?

Answer 24

Ulnar nerve

Question 25

Origin of the opponens digiti minimi

Answer 25

- Hook of Hamate | - Flexor Retinaculum

Question 26

Insertion of the opponens digiti minimi

Answer 26

Medial border of 5th metacarpal

Question 27

What does the opponens digiti minimi do?

Answer 27

Draws 5th metacarpal anteriorly and rotates it, bringing little finger (5th digit) into opposition with thumb

Question 28

What is the opponens digiti minimi innervated by?

Answer 28

Ulnar Nerve

Question 29

Origin of the palmar interosseous muscles

Answer 29

Palmar surfaces of 2nd, 4th and 5th metacarpals (as unipennate muscles)

Question 30

Insertion of the palmar interosseous muscles

Answer 30

Extensor expansions of digits and bases of proximal phalanges of 2nd, 4th, and 5th digits

Question 31

What do the palmar interosseous muscles do?

Answer 31

Adduct 2nd, 4th, and 5th digits toward axial line and assists the lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 32

What are the palmar interosseous muscles innervated by?

Answer 32

Ulnar Nerve

Question 33

Origin of the dorsal interosseous muscles

Answer 33

Adjacent sides of two metacarpals (as bipennate muscles)

Question 34

Insertion of the dorsal interosseous muscles

Answer 34

Extensor expansions and bases of proximal phalanges of 2nd – 4th digits

Question 35

What do the dorsal interosseous muscles do?

Answer 35

Abduct 2nd – 4th digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints

Question 36

What are the dorsal interosseous muscles innervated by?

Answer 36

Ulnar Nerve

Question 37

Origin of the Lumbricals

Answer 37

Tendons of flexor digitorum profundus (palmar side of hand)

Question 38

Insertion of the Lumbricals

Answer 38

Lateral sides of extensor expansion of 2nd – 4th digits (dorsal side of hand)

Question 39

What do the lumbricasl do?

Answer 39

Finger flexion at the metacarpophalangeal jointand finger extension at the interphalangeal joint

Question 40

What innervates the lumbricals?

Answer 40

Median and Ulnar Nerves