Intrinsic Muscles Of The Hand

Question 0

Proximal and distal attachment of opponens pollicis

Answer 0

P: flexor retinaculum and tubercles of scaphoid and trapezium
D: lateral side of 1st metacarpal

Question 1

Name the thenar muscles

Answer 1

Opponents pollicis, flexor pollicis brevis, abductor pollicis brevis and adductor pollicis

Question 2

Innervation of opponens pollicis

Answer 2

Median nerve

Question 3

Actions of opponens pollicis

Answer 3

Oppose the thumb by drawing 1st metacarpal medially to Palm and rotating it medially

Question 4

O and I of abductor pollicis brevis

Answer 4

O: flexor retinaculum and tubercles of scaphoid and trapezium
I: lateral side of base of proximal phalanx of thumb

Question 5

Innervation of abductor pollicis brevis

Answer 5

Median nerve

Question 6

Action if abductor pollicis brevis

Answer 6

Adducts the thumb, helps oppose it

Question 7

O and I of flexor pollicis brevis

Answer 7

O: flexor retinaculum and tubercles of scaphoid and trapezium
I: lateral side of base of 1st phalanx of the thumb

Question 8

Innervations for flexor pollicis brevis

Answer 8

Superficial head = median nerve

Deep head = ulnar nerve

Question 9

Action of flexor pollicis brevis

Answer 9

Flexes thumb

Question 10

O and I of adductor pollicis

Answer 10

O of Oblique head: bases if 2nd and 3rd metacarpals, capitate and adjacent carpals
O of Transverse head: anterior surface of shaft of 3rd metacarpal

I: medial side of base of proximal phalanx of thumb

Question 11

Innervation of adductor pollicis

Answer 11

Ulnar nerve

Question 12

Action of adductor pollicis

Answer 12

Adducts thumb towards border of Palm

Question 13

List the hypothenar muscles

Answer 13

Abductor Digiti Minimi
Flexor Digiti Minimi brevis
Opponens Digiti

Question 14

Origin and insertion of abductor Digiti Minimi

Answer 14

O: pisiform
I: medial side if base of proximal phalanx of 5th digit

Question 15

Nerve for abductor Digiti Minimi

Answer 15

Ulnar nerve

Question 16

Action of abductor Digiti Minimi

Answer 16

Abducts 5th digit

Assists in flexion of its proximal phalanx

Question 17

Flexor Digiti Minimi o and I

Answer 17

O: hook of hamate and flexor retinaculum
I: medial border of 5th metacarpal

Question 18

Nerve for flexor Digiti Minimi

Answer 18

Ulnar nerve

Question 19

Action of flexor Digiti Minimi

Answer 19

Flexes prox phalanx of 5th digit

Question 20

Opponens Digiti o and I

Answer 20

O: hook of hamate and flexor retinaculum
I: medial border of 5th metacarpal

Question 21

Innervation of opponens Digiti

Answer 21

Ulnar nerve

Question 22

Action of opponens Digiti

Answer 22

Draws 5th metacarpal anterior and rotates it, bringing 5th digit into opposition with thumb

Question 23

Name short muscles of hand

Answer 23

Lumberjacks and interossei

Question 24

O and I of 1st and 2nd lumbricals

Answer 24

O: lateral 2 tendons of flexor digitorum Profundus I: lateral side of extensor expansion and 2nd-5th (radial side)

Question 25

Innervation of 1st and 2nd lumbricals

Answer 25

Median nerve

Question 26

Action of lumbricals

Answer 26

Flex the MCP joints; extend interphalangeal joints of 2nd-5th digits

Question 27

O and I of lumbricals 3-4

Answer 27

O: medial 3 tendons of flexor digitorum Profundus I: lateral side of extension expansion of 2nd - 5th digits (radial side)

Question 28

Innervation of 3rd &4rth lumbricals

Answer 28

Ulnar nerve

Question 29

O and I of dorsal interossei 1-4

Answer 29

O: adjacent sides of 2metacarpals (bi-pennate muscles) I: bases of proximal phalanges and extensor expansion of 2-4 digits

Question 30

Innervation of interossei

Answer 30

Ulnar nerve

Question 31

Action of dorsal interossei 1-4

Answer 31

Abduct 2-4th digits from axial line | Acts with lumbricals in flexing the MCP joints and extending the interphalangeal joints

Question 32

O and I of palmar interossei 1-3

Answer 32

O: Palmar surfaces of 2, 4& 5th metacarpals (uni pennate ) I: bases of prox phalanges, extensor expansions of 2nd, 4rth and 5th digits

Question 33

Action of interossei Palmer

Answer 33

Adducts 2,4,5 digits towards axial line, assists lumbricals in flexing metacarpophalangeal joints and extending into phalangeal joints,