Hand Muscles (Thenar and Hypothenar)

Question 1

Action of Abductor Digiti Minimi

Answer 1

Abducts 5th digit

Question 2

Action of Abductor Pollicis Brevis

Answer 2

Abducts thumb and helps oppose it

Question 2

Action of Adductor Pollicis

Answer 2

Adducts thumb toward middle digit

Question 3

Action of Flexor Digiti Minimi

Answer 3

Flexes proximal phalanx of 5th digit

Question 3

Action of Dorsal Interossei 1-4

Answer 3

Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints

Question 4

Action of Flexor Pollicis Brevis

Answer 4

Flexes thumb

Question 5

Action of Lumbricals 1 and 2

Answer 5

Flex digits and metacarpophalangeal joints and extend interphalangeal joints

Question 5

Action of Lumbricals 3 and 4

Answer 5

Flex digits at metacarpophalangeal joints and extend interphalangeal joints

Question 6

Action of Opponens Pollicis

Answer 6

Opposition, medial rotations

Question 6

Action of Opponens Digiti Minimi

Answer 6

Opposition of 5th digit

Question 7

Action of Palmar Interossei 1-4

Answer 7

Adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 8

Innervation of Abductor Digiti Minimi

Answer 8

Deep branch of ulnar nerve (C8-T1)

Question 9

Innervation of Abductor Pollicis Brevis

Answer 9

Recurrent branch of median nerve (C8-T1)

Question 9

Innervation of Adductor Pollicis

Answer 9

Deep branch of ulnar nerve

Question 10

Innervation of Dorsal Interossei 1-4

Answer 10

Deep branch of ulnar nerve (C8-T1)

Question 11

Innervation of Flexor Digiti Minimi

Answer 11

Deep branch of the ulnar nerve (C8-T1)

Question 13

Innervation of Flexor Pollicis Brevis

Answer 13

Recurrent branch of the median nerve (C8-T1)

Question 14

Innervation of Lumbricals 1 and 2

Answer 14

Median Nerve (C8-T1)

Question 15

Innervation of Opponens Digiti Minimi

Answer 15

Deep branch of ulnar nerve (C8-T1)

Question 15

Innervation of Lumbricals 3 and 4

Answer 15

Deep branch of ulnar nerve (C8-T1)

Question 16

Innervation of Opponens Pollicis

Answer 16

Recurrent branch of the median nerve (C8-T1)

Question 17

Innervation of Palmar Interossei 1-4

Answer 17

Deep branch of ulnar nerve (C8-T1)

Question 19

Insertion of Abductor Digiti Minimi

Answer 19

Medial side of base of proximal phalanx of 5th digit

Question 20

Insertion of Abductor Pollicis Brevis

Answer 20

Lateral side of base proximal phalanx of thumb

Question 21

Insertion of Adductor Pollicis

Answer 21

Medial side of base of proximal phalanx of thumb

Question 22

Insertion of Dorsal Interossei 1-4

Answer 22

Extensor expansions and bases of proximal phalanges of digits 2-4

Question 23

Insertion of Flexor Digiti Minimi

Answer 23

Medial side of base of proximal phalanx of 5th digit

Question 24

Insertion of Flexor Pollicis Brevis

Answer 24

Lateral side of base proximal phalanx of thumb

Question 26

Insertion of Opponens Digiti Minimi

Answer 26

Medial border of 5th metacarpal

Question 27

Insertion of Opponens Pollicis

Answer 27

Lateral side of 1st metacarpal

Question 27

Insertion of Palmar Interossei 1-4

Answer 27

Extensor expansions of digits and bases of proximal phalanges of digits 2,4, and 5

Question 29

Insertions of Lumbricals 1 and 2

Answer 29

Lateral side of extensor expansions of digits 1 and 2

Question 30

Insertions of Lumbricals 3 and 4

Answer 30

Lateral side of extensor expansions of digits 4 and 5

Question 32

Origin of Abductor Digiti Minimi

Answer 32

Pisiform

Question 33

Origin of Abductor Pollicis Brevis

Answer 33

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 34

Origin of Adductor Pollicis

Answer 34

Oblique head: bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals Transverse Head: anterior surface of body of 3rd metacarpal

Question 36

Origin of Flexor Digiti Minimi

Answer 36

Hook of Hamate, flexor retinaculum

Question 38

Origin of Flexor Pollicis Brevis

Answer 38

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 39

Origin of Opponens Digiti Minimi

Answer 39

Hook of hamate, flexor retinaculum

Question 40

Origin of Dorsal Interossei 1-4

Answer 40

Adjacent sides of two metacarpals

Question 41

Origin of Opponens Pollicis

Answer 41

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 42

Origin of Palmar Interossei 1-4

Answer 42

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

Question 43

Origins Lumbricals 3 and 4

Answer 43

Medial three tendons of flexor digitorum profundus

Question 44

Origins of Lumbricals 1 and 2

Answer 44

Lateral two tendons of flexor digitorum profundus