Exam 2 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 is the innervation of 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 innervation of abductor pollicis brevis?

Answer 6

Recurrent branch of median nerve C8, T1

Question 7

What is the action of abductor pollicis brevis?

Answer 7

Abducts thumb, helps oppose it

Question 8

What is the origin of flexor pollicis brevis?

Answer 8

Superficial and deep heads

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 9

What is the insertion of flexor pollicis brevis?

Answer 9

Lateral side of base of proximal phalanx of thumb

Question 10

What is the innervation of flexor pollicis brevis?

Answer 10

Recurrent branch of median nerve C8, T1

Question 11

What is the action of flexor pollicis brevis?

Answer 11

Flexes thumb

Question 12

What is the origin of abductor digiti minimi?

Answer 12

pisiform

Question 13

What is the insertion of abductor digiti minimi?

Answer 13

medial side of base of proximal phalanx of 5th finger

Question 14

What is the innervation of abductor digiti minimi?

Answer 14

Deep branch of ulnar nerve C8, T1

Question 15

What is the action of abductor digiti minimi?

Answer 15

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

Question 16

What is the origin of flexor digiti minimi brevis?

Answer 16

Hook of hamate and flexor retinaculum

Question 17

What is the insertion of flexor digiti minimi brevis?

Answer 17

Medial side of base of proximal phalanx of 5th finger

Question 18

What is the innervation of flexor digiti minimi brevis?

Answer 18

Deep branch of ulnar nerve C8, T1

Question 19

What is the action of flexor digiti minimi brevis?

Answer 19

Flexes proximal phalanx of 5th finger

Question 20

What is the origin of opponens digiti minimi?

Answer 20

Hook of hamate and flexor retinaculum

Question 21

What is the insertion of opponens digiti minimi?

Answer 21

medial border of 5th metacarpal

Question 22

What is the innervation of opponens digiti minimi?

Answer 22

Deep branch of ulnar nerve C8, T1

Question 23

What is the action of opponens digiti minimi?

Answer 23

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

Question 24

What is the origin of lumbricals?

Answer 24

1 and 2: lateral two tendons of flexor digitorum profundus 3 and 4: medial three tendons of flexor digitorum profundus

Question 25

What is the insertion of lumbricals?

Answer 25

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

Question 26

What is the innervation of lumbricals?

Answer 26

Median nerve C8, T1

Question 27

What is the action of lumbricals?

Answer 27

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

Question 28

What is the origin of dorsal interossei? 1-4

Answer 28

Adjacent sides of two metacarpals

Question 29

What is the insertion of dorsal interossei 1-4?

Answer 29

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

Question 30

What is the innervation of dorsal interossei 1-4?

Answer 30

deep branch of ulnar nerve C8, T1

Question 31

What is the action of dorsal interossei 1-4?

Answer 31

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

Question 32

What is the origin of palmar interossei 1-3?

Answer 32

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

Question 33

What is the insertion of palmar interossei 1-3?

Answer 33

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

Question 34

What is the innervation of palmar interossei 1-3?

Answer 34

Deep branch of ulnar nerve C8, T1

Question 35

What is the action of palmar interosssei 1-3?

Answer 35

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

Question 36

What is the origin of adductor pollicus? 2

Answer 36

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

Question 37

What is the insertion if adductor pollicus?

Answer 37

Medial side of base of proximal phalanx of thumb

Question 38

What is the innervation of adductor pollicus?

Answer 38

deep branch of ulnar nerve C8, T1

Question 39

What is the action of adductor pollicus?

Answer 39

Adducts thumb toward lateral border of palm