Intrinsic Muscles of the Hand

Question 0

Which muscles make up the thenar muscles?

Answer 0

1. Abductor pollicis brevis
2. Flexor pollicis brevis
3. Oppenens pollicis

Question 1

Name the intrinsic muscles of the hand?

Answer 1

1. Thenar muscles
2. Adductor pollicis
3. Hypothenar muscles
4. “Short” muscles of the hand

Question 2

Main action of the abductor pollicis brevis?

Answer 2

Abducts thumb; helps to oppose thumb

Question 3

Main action of the flexor pollicis brevis?

Answer 3

Flexes thumb

Question 4

Main action of the oppenens pollicis?

Answer 4

Laterally opposes & medially rotates thumb

Question 5

Innervation of thenar muscles?

Answer 5

Median nerve

Question 6

Proximal attachment of thenar muscles?

Answer 6

• Flexor retinaculum

- Tubercles of scaphoid & trapezium

Question 7

Distal attachment of abductor pollicis muscle?

Answer 7

Lat. side of base of prox. thumb phalanx

Question 8

Distal attachment of flexor pollicis brevis?

Answer 8

Lat. side of base of prox. thumb phalanx

Question 9

Distal attachment of opponens pollicis?

Answer 9

Lat. side of 1st metacarpal

Question 10

Main action of adductor pollicis?

Answer 10

Adducts thumb towards middle digit

Question 11

Innervation of adductor pollicis?

Answer 11

Ulnar nerve

Question 12

Proximal attachment of adductor pollicis?

Answer 12

1. Oblique head:
   - Base of 2nd & 3rd metacarpal
   - Capitate
   - Adjacent carpals
2. Transverse head:
   - Ant. surface of body of 3rd metacarpal

Question 13

Distal attachment of adductor pollicis?

Answer 13

Med. side of base of proximal phalanx of thumb

Question 14

Which muscles make up the hypothenar muscles?

Answer 14

1. Abductor digiti minimi
2. Flexor digiti minimi
3. Opponens digiti minimi

Question 15

Main action of the abductor digiti minimi?

Answer 15

Abducts 5th digits

Question 16

Main action of the flexor digiti minimi?

Answer 16

Flexes proximal phalanx of 5th digit

Question 17

Main action of the opponens digiti mini?

Answer 17

Draws 5th digit anteriorly & rotates it

Question 18

Innervation of hypothenar muscles?

Answer 18

Ulnar nerve

Question 19

Proximal attachment of the abductor digiti minimi?

Answer 19

Pisiform

Question 20

Distal attachment of abductor digiti minimi?

Answer 20

Med. side of base of proximal phalanx of digiti minimi

Question 21

Proximal attachment of the flexor digiti minimi?

Answer 21

Flexor retinaculum & hook of hamate

Question 22

Distal attachment of the flexor digiti minimi?

Answer 22

Med. side of proximal phalanx of digiti minimi

Question 23

Proximal attachment of the opponens digiti minimi?

Answer 23

Flexor retinaculum & hook of hamate

Question 24

Distal attachment of the opponens digiti minimi?

Answer 24

Med. border of 5th metacarpal

Question 25

Which muscles make up the "short" muscles of the hand?

Answer 25

1. Lumbricals 2. Dorsal interossei (1-4) 3. Palmar interossei (1-3)

Question 26

Main action of the lumbricals?

Answer 26

- Flex digits at metacarpophalangeal joints | - Extends interphalangeal joints

Question 27

Main action of the dorsal interossei muscles?

Answer 27

Abducts digits from axial line

Question 28

Main action of the palmar interossei muscles?

Answer 28

Adducts digits towards axial line

Question 29

Innervation of lumbricals?

Answer 29

1-2: median nerve | 3-4: ulnar nerve

Question 30

Innervation of dorsal and palmar interossei?

Answer 30

Ulnar nerve

Question 31

Proximal attachment of the lumbricals?

Answer 31

- 1 & 2: lateral tendons of flexor digitorum profundus | - 3 & 4: medial 2 tendons of flexor digitorum profundus

Question 32

Distal attachment of lumbricals?

Answer 32

Lat. side of extensor expansion of digitis 2-5

Question 33

Proximal attachment of the dorsal interossei?

Answer 33

Adjacent sides of 2 metacarpals

Question 34

Distal attachment of dorsal interossei?

Answer 34

Lat. sides of extensor expansions of digits 2-5

Question 35

Proximal attachment of the palmar interossei?

Answer 35

Palmar surface of 2nd, 4th & 5th metacarpals

Question 36

Distal attachment of palmar interossei?

Answer 36

Extensor expansions & bases of proximal phlanges of digits 2, 4 & 5