Intrinsic Muscles of Hand

Question 0

What is the insertion of opponens pollicis?

Answer 0

Lateral side of 1st metacarpal

Question 1

What is the origin of opponens pollicis?

Answer 1

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 2

What innervates opponens pollicis?

Answer 2

Recurrent branch of median nerve (C8, T1)

Question 3

What is the action of opponens pollicis?

Answer 3

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

Question 4

What is the origin of abductor pollicis brevis?

Answer 4

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 5

What is the insertion of abductor pollicis brevis?

Answer 5

Lateral side of base of proximal phalanx of thumb

Question 6

What is the action of abductor pollicis brevis?

Answer 6

Abducts thumb; helps oppose it

Question 7

What is the origin of flexor pollicis brevis?

Answer 7

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 8

What is the insertion of flexor pollicis brevis?

Answer 8

Lateral side of base of proximal phalanx of thumb

Question 9

What innervates flexor pollicis brevis?

Answer 9

Superficial head: Recurrent branch of median (C8, T1)

Deep head: Deep branch of ulnar nerve (C8, T1)

Question 10

What is the action of flexor pollicis brevis?

Answer 10

Flexes thumb

Question 11

What is the origin of adductor pollicis?

Answer 11

Oblique head: Bases of 2nd & 3rd metacarpals, capitate, adjacent carpals
Transverse head: Anterior surface of shaft of 3rd metacarpal

Question 12

What is the insertion of adductor pollicis?

Answer 12

Medial side of base of proximal phalanx of thumb

Question 13

What innervates adductor pollicis?

Answer 13

Deep branch of ulnar nerve (C8, T1)

Question 14

What is the action of adductor pollicis?

Answer 14

Adducts thumb toward lateral border of palm

Question 15

What is the origin of abductor digiti minimi?

Answer 15

Pisiform

Question 16

What is the insertion of abductor digiti minimi?

Answer 16

Medial side of base of proximal phalanx of 5th finger

Question 17

What innervates abductor digiti minimi?

Answer 17

Deep branch of ulnar nerve (C8, T1)

Question 18

What is the action of abductor digiti minimi?

Answer 18

Abducts 5th finger; assists in flexion of its proximal phalanx

Question 19

What is the origin of flexor digiti minimi brevis?

Answer 19

Hook of hamate and flexor retinaculum

Question 20

What is the insertion of flexor digiti minimi brevis?

Answer 20

Medial side of base of proximal phalanx of 5th finger

Question 21

What innervates flexor digiti minimi brevis?

Answer 21

Deep branch of ulnar nerve (C8, T1)

Question 22

What is the action of flexor digiti minimi brevis?

Answer 22

Flexes proximal phalanx of 5th finger

Question 23

What is the origin of opponens digiti minimi?

Answer 23

Hook of hamate and flexor retinaculum

Question 24

What is the insertion of opponens digiti minimi?

Answer 24

Medial border of 5th metacarpal

Question 25

What innervates opponens digiti minimi?

Answer 25

Deep branch of ulnar nerve (C8, T1)

Question 26

What is the action of opponens digiti minimi?

Answer 26

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

Question 27

What is the origin of lumbricals 1 & 2?

Answer 27

Lateral 2 tendons of flexor digitorum profundus (as unipennate muscles)

Question 28

What is the insertion of lumbricals 1 & 2?

Answer 28

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

Question 29

What innervates lumbricals 1 & 2?

Answer 29

Median nerve (C8, T1)

Question 30

What is the action of lumbricals 1 & 2?

Answer 30

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers

Question 31

What is the origin of lumbricals 3 & 4?

Answer 31

Medial 3 tendons of flexor digitorum profundus (as bipennate muscles)

Question 32

What is the insertion of lumbricals 3 & 4?

Answer 32

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

Question 33

What innervates lumbricals 3 & 4?

Answer 33

Deep branch of ulnar nerve (C8, T1)

Question 34

What is the action of lumbricals 3 & 4?

Answer 34

Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers

Question 35

What is the origin of dorsal interossei (1-4)?

Answer 35

Adjacent sides of two metacarpals (as bipennate muscles)

Question 36

What is the insertion of dorsal interossei (1-4)?

Answer 36

Bases of proximal phalanges; extensor expansions of 2nd-4th fingers

Question 37

What innervates dorsal interossei (1-4)?

Answer 37

Deep branch of ulnar nerve (C8, T1)

Question 38

What is the action of dorsal interossei (1-4)?

Answer 38

Abduct 2nd-4th fingers from axial line; act with lumbricals in flexing metacarpophalangeal joints & extending interphalangeal joints

Question 39

What is the origin of palmar interossei (1-3)?

Answer 39

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

Question 40

What is the insertion of palmar interossei (1-3)?

Answer 40

Bases of proximal phalanges; extensor expansions of 2nd, 4th, & 5th fingers

Question 41

What innervates palmar interossei (1-3)?

Answer 41

Deep branch of ulnar nerve (C8, T1)

Question 42

What is the action of palmar interossei (1-3)?

Answer 42

Adduct 2nd, 4th, & 5th fingers toward axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 43

What is the innervation of abductor pollicis brevis?

Answer 43

Recurrent branch of median nerve (C8, T1)