Intrinsic Muscles Of The Hand

Question 0

Insertion of opponens pollicis

Answer 0

Lateral side of 1st metacarpal

Question 1

Origin of opponens pollicis

Answer 1

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 2

Innervation of opponens pollicis

Answer 2

Recurrent branch of median nerve (c8 and t1)

Question 3

Actions of opponens pollicis

Answer 3

To oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially

Question 4

Origin of abductor pollicis brevis

Answer 4

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 5

Insertion of abductor pollicis brevis

Answer 5

Lateral side of base of proximal phalanx of thumb

Question 6

Innervation of abductor pollicis brevis

Answer 6

Recurrent branch of median nerve (c8 and t1)

Question 7

Actions of abductor pollicis brevis

Answer 7

Abducts thumb, helps oppose it

Question 8

Origin of flexor pollicis brevis (superficial and deep heads)

Answer 8

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 9

Insertion of flexor pollicis brevis (superficial and deep heads)

Answer 9

Lateral side of base of proximal phalanx of thumb

Question 10

Innervation of flexor pollicis brevis

Answer 10

Superficial head: Recurrent branch of median nerve (c8 and t1)
Deep head: deep branch of ulnar nerve (c8 and t1)

Question 11

Action of flexor pollicis brevis (superficial and deep heads)

Answer 11

Flexes thumb

Question 12

Origin of adductor pollicis (oblique head)

Answer 12

Bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals

Question 13

Origin of adductor pollicis (transverse head)

Answer 13

Anterior surface of shaft of 3rd metacarpal

Question 14

Insertion of adductor pollicis (oblique and transverse heads)

Answer 14

Medial side of base of proximal phalanx of thumb

Question 15

Innervation of adductor pollicis (oblique and transverse heads)

Answer 15

Deep branch of ulnar nerve (c8 and t1)

Question 16

Action of adductor pollicis (oblique and transverse heads)

Answer 16

Adducts thumb toward lateral border of palm

Question 17

Origin of abductor digiti minimi

Answer 17

Pisiform

Question 18

Insertion of abductor digiti minimi

Answer 18

Medial side of base of proximal phalanx of 5th finger

Question 19

Innervation of abductor digiti minimi

Answer 19

Deep branch of ulnar nerve (c8 and t1)

Question 20

Actions of abductor digiti minimi

Answer 20

Abducts 5th finger

Assists in flexion of its proximal phalanx

Question 21

Origin of flexor digiti minimi brevis

Answer 21

Hook of hamate and flexor retinaculum

Question 22

Insertion of flexor digiti minimi brevis

Answer 22

Medial side of base of proximal phalanx of 5th finger

Question 23

Innervation of flexor digiti minimi brevis

Answer 23

Deep branch of ulnar nerve (c8 and t1)

Question 24

Action of flexor digiti minimi brevis

Answer 24

Flexes proximal phalanx of 5th finger

Question 25

Origin of opponens digiti minimi

Answer 25

Hook of hamate and flexor retinaculum

Question 26

Insertion of opponens digiti minimi

Answer 26

Medial border of 5th metacarpal

Question 27

Innervation of opponens digiti minimi

Answer 27

Deep branch of ulnar nerve (c8 and t1)

Question 28

Actions of opponens digiti minimi

Answer 28

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

Question 29

Origin of lumbricals 1 and 2

Answer 29

Lateral two tendons of flexor digitorum profundus (as unipennate muscles)

Question 30

Insertion of lumbricals 1 and 2

Answer 30

Lateral side of extensor expansions of 2nd-5th fingers

Question 31

Innervation of lumbricals 1 and 2

Answer 31

Median nerve (c8 and t1)

Question 32

Actions of lumbricals (1,2,3, and 4)

Answer 32

Flex metacarpophalangeal joints

Extend interphalangeal joints of 2nd-5th fingers

Question 33

Origin of lumbricals (3 and 4)

Answer 33

Medial three tendons of flexor digitorum profundus (as bipennate muscles)

Question 34

Insertion of lumbricals (3 and 4)

Answer 34

Lateral sides of extensor expansions of 2nd-5th fingers

Question 35

Innervation of lumbricals (3 and 4)

Answer 35

Deep branch of ulnar nerve (c8 and t1)

Question 36

Origin of dorsal interossei, 1-4

Answer 36

Adjacent sides of two metacarpals (as bipennate muscles)

Question 37

Insertion of dorsal interossei, 1-4

Answer 37

Bases of proximal phalanges

Extensor expansions of 2nd-4th fingers

Question 38

Innervation of dorsal interossei, 1-4

Answer 38

Deep branch of ulnar nerve (c8 and t1)

Question 39

Actions of dorsal interossei, 1-4

Answer 39

Abduct 2nd-4th fingers from axial line

Act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 40

Origin of palmar interossei, 1-3

Answer 40

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

Question 41

Insertion of palmar interossei, 1-3

Answer 41

Bases of proximal phalanges

Extensor expansions of 2nd, 4th, and 5th fingers

Question 42

Innervation of palmar interossei, 1-3

Answer 42

Deep branch of ulnar nerve (c8 and t1)

Question 43

Actions of palmar interossei, 1-3

Answer 43

Adduct 2nd, 4th, and 5th fingers toward axial line

Assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 44

Which intrinsic hand muscles are thenar muscles

Answer 44

Opponens pollicis, abductor pollicis brevis, flexor pollicis brevis, and adductor pollicis

Question 45

Which intrinsic hand muscles are hypothenar muscles?

Answer 45

Abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi

Question 46

Which intrinsic hand muscles are short muscles?

Answer 46

Lumbricals, dorsal interossei, and palmar interossei