Forearm and Hand Muscles - Hand

Question 1

Abductor Pollicis Brevis Origin

Answer 1

Flexor retinaculum and tubercles of the scaphoid and trapezium

Question 2

Abductor Pollicis Brevis Insertion

Answer 2

Lateral side and base of proximal phalanx of the thumb

Question 3

Abductor Pollicis Brevis Innervation

Answer 3

Recurrent branch of the median nerve

Question 4

Abductor Pollicis Brevis Action

Answer 4

Abduction of the thumb, helps oppose it

Question 5

Abductor Pollicis Brevis Root

Answer 5

C8, T1

Question 6

Flexor Pollicis Brevis Origin

Answer 6

Flexor retinaculum and tubercles of the scaphoid and trapezium

Question 7

Flexor Pollicis Brevis Insertion

Answer 7

Lateral side of the proximal phalanx of the thumb

Question 8

Flexor Pollicis Brevis Innervation

Answer 8

Recurrent branch of the median nerve

Question 9

Flexor Pollicis Brevis Action

Answer 9

Flexion of the thumb

Question 10

Flexor Pollicis Brevis Root

Answer 10

C8, T1

Question 11

Opponens Pollicis Origin

Answer 11

Flexor retinaculum and tubercles of the scaphoid and trapezium

Question 12

Opponens Pollicis Insertion

Answer 12

Lateral side of the 1st metacarpal

Question 13

Opponens Pollicis Innervation

Answer 13

Recurrent branch of the median nerve

Question 14

Opponens Pollicis Action

Answer 14

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

Question 15

Opponens Pollicis Root

Answer 15

C8, T1

Question 16

Abductor Digiti Minimi Origin

Answer 16

Pisiform

Question 17

Abductor Digiti Minimi Insertion

Answer 17

Medial side of the base of proximal phalanx of the 5th digit

Question 18

Abductor Digiti Minimi Innervation

Answer 18

Deep branch of the ulnar nerve

Question 19

Abductor Digiti Minimi Action

Answer 19

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

Question 20

Abductor Digiti Minimi Root

Answer 20

C8, T1

Question 21

Flexor Digiti Minimi Origin

Answer 21

Hook of hamate and flexor retinaculum

Question 22

Flexor Digiti Minimi Insertion

Answer 22

Medial side of the base of proxmial phalanc of the 5th digit

Question 23

Flexor Digiti Minimi Innervation

Answer 23

Deep branch of the ulnar nerve

Question 24

Flexor Digiti Minimi Action

Answer 24

Flexes proximal phalanx of 5th digit

Question 25

Flexor Digiti Minimi Root

Answer 25

C8, T1

Question 26

Opponens Digiti Origin

Answer 26

Hook of hamate and flexor retinaculum

Question 27

Opponens Digiti Insertion

Answer 27

Medial border of the 5th metacarpal

Question 28

Opponens Digiti Innervation

Answer 28

Deep branch of the ulnar nerve

Question 29

Opponens Digiti Action

Answer 29

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

Question 30

Opponens Digiti Root

Answer 30

C8, T1

Question 31

Lumbricals (1-2) Origin

Answer 31

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

Question 32

Lumbricals (1-2) Insertion

Answer 32

Lateral sides of the extensor expansions of the digits (2-5)

Question 33

Lumbricals (1-2) Innervation

Answer 33

Median nerve

Question 34

Lumbricals (1-2) Action

Answer 34

Flex metacarpophalangeal joints; extend interphalangeal joints of 2-5 digits

Question 35

Lumbricals (1-2) Root

Answer 35

C8, T1

Question 36

Lumbricals (3-4) Origin

Answer 36

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

Question 37

Lumbricals (3-4) Insertion

Answer 37

Lateral sides of the extensor expansions of the digits (2-5)

Question 38

Lumbricals (3-4) Innervation

Answer 38

Deep branch of the ulnar nerve

Question 39

Lumbricals (3-4) Action

Answer 39

Flex metacarpophalangeal joints; extend interphalangeal joints of 2-5 digits

Question 40

Lumbricals (3-4) Root

Answer 40

C8,T1

Question 41

Palmar Interossei (1-3) Origin

Answer 41

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

Question 42

Palmar Interossei (1-3) Insertion

Answer 42

Bases of the proximal phalanges and extensor expansions of (2,4,5) digits

Question 43

Palmar Interossei Innervation

Answer 43

Deep branch of the ulnar nerve

Question 44

Palmar Interossei Action

Answer 44

Adduct (2,4,5) digits toward axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints; extensor expansions of digits 2-4

Question 45

Palmar Interossei Root

Answer 45

C8, T1

Question 46

Dorsal Interossei (1-4) Origin

Answer 46

Adjacent sides of two metacarpals (as bipennate muscles)

Question 47

Dorsal Interossei (1-4) Insertion

Answer 47

Bases of the proximal phalanges, extensor expansions of 2-4th digits

Question 48

Dorsal Interossei (1-4) Innervation

Answer 48

Deep branch of the ulnar nerve

Question 49

Dorsal Interossei (1-4) Action

Answer 49

Abduct 2-4th digits from the axial line, act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 50

Dorsal Interossei (1-4) Root

Answer 50

C8, T1

Question 51

Adductor Pollicis Origin

Answer 51

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

Question 52

Adductor Pollicis Insertion

Answer 52

Medial side of base of proximal phalanx of thumb

Question 53

Adductor Pollicis Innervation

Answer 53

recurrent branch of median nerve (C8,T1)

Question 54

Adductor Pollicis Action

Answer 54

Adducts thumb lateral border of palm

Question 55

Adductor Pollicis Root

Answer 55

C8,T1

Question 56

Palmaris Brevis Origin

Answer 56

Deep surface of dermis in proximal, anterior and medial aspect of palm

Question 57

Palmaris Brevis Insertion

Answer 57

Medial border of palmar aponeurosis

Question 58

Palmaris Brevis Innervation

Answer 58

Superficial branch of ulnar nerve

Question 59

Palmaris Brevis Action

Answer 59

Wrinkles palmar skin; protects the ulnar neurovasculature through tunnel of guyon