Muscles Of The Hand

Question 0

Insertion of the opponens pollicis

Answer 0

Lateral side of the first metacarpal

Question 1

Origin of the opponens pollicis

Answer 1

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 2

Innervation of the opponens pollicis

Answer 2

Recurrent branch of median nerve (C8, T1)

Question 3

Actions of the opponens pollicis

Answer 3

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

Question 4

Origin of the abductor pollicis brevis

Answer 4

Flexor retinaculum and tubercle of the scaphoid and trapezium

Question 5

Insertion of the 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, T1)

Question 7

Actions of the abductor pollicis brevis

Answer 7

Abducts thumb; helps oppose it

Question 8

Origin of the flexor pollicis brevis (superficial head, deep head)

Answer 8

Flexor retinaculum and tubercles of scaphoid and trapezium

Question 9

Insertion of the flexor pollicis brevis (superficial head, deep head)

Answer 9

Lateral side of base of proximal phalanx of thumb

Question 10

Innervation of the flexor pollicis brevis (superficial head, deep head)

Answer 10

Recurrent branch of the median nerve (C8, T1)

Question 11

Actions of the flexor pollicis brevis (superficial head, deep head)

Answer 11

Flexes thumb

Question 12

Origin of adductor pollicis

Answer 12

Oblique head: bases of the 2nd and 3rd metacarpals, capitate, and adjacent carpals

Transverse head: anterior surface of shaft of 3rd metacarpal

Question 13

Insertion of the adductor pollicis

Answer 13

Medial side of base of proximal phalanx of thumb

Question 14

Innervation of the adductor pollicis

Answer 14

Deep branch of ulnar nerve (C8, T1)

Question 15

Actions of the adductor pollicis

Answer 15

Adducts thumb toward lateral border of palm

Question 16

Origin of the abductor digiti minimi

Answer 16

Pisiform

Question 17

Insertion of abductor digiti minimi

Answer 17

Medial side of base of proximal phalanx of 5th finger

Question 18

Innervation of abductor digiti minimi

Answer 18

Deep branch of ulnar nerve (C8, T1)

Question 19

Actions of the abductor digiti minimi

Answer 19

Abducts 5th finger

Assists in flexion of its proximal phalanx

Question 20

Origin of the flexor digiti minimi brevis

Answer 20

Hook of hamate and flexor retinaculum

Question 21

Insertion of the flexor digiti minimi brevis

Answer 21

Medial side of base of proximal phalanx of 5th finger

Question 22

Innervation of the flexor digiti minimi brevis

Answer 22

Deep branch of the ulnar nerve (C8, T1)

Question 23

Actions of the flexor digiti minimi brevis

Answer 23

Flexes proximal phalanx of 5th finger

Question 24

Origin of the opponens digiti minimi

Answer 24

Hook of hamate and flexor retinaculum

Question 25

Insertion of the opponens digiti minimi

Answer 25

Medial border of 5th metacarpal

Question 26

Innervation of the opponens digiti minimi

Answer 26

Deep branch of the ulnar nerve (C8, T1)

Question 27

Actions of the opponens digiti minimi

Answer 27

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

Question 28

Origin of the 1st and 2nd lumbricals

Answer 28

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

Question 29

Insertions of 1st and 2nd lumbricals

Answer 29

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

Question 30

Innervation of the 1st and 2nd lumbricals

Answer 30

Median nerve (C8, T1)

Question 31

Actions of the 1st and 2nd lumbricals

Answer 31

Flex metacarpophalangeal joints | Extend interphalangeal joints of 2nd-5th fingers

Question 32

Origin of the 3rd and 4th lumbricals

Answer 32

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

Question 33

Insertion of the 3rd and 4th lumbricals

Answer 33

Lateral sides of extensor expansion of the 2nd-5th fingers

Question 34

Innervation of the 3rd and 4th lumbricals

Answer 34

Deep branch of ulnar nerve (C8, T1)

Question 35

Actions of the 3rd and 4th lumbricals

Answer 35

Flex metacarpophalangeal joints | Extend interphalangeal joints of 2nd-5th fingers

Question 36

Origin of the dorsal interossei (1-4)

Answer 36

Adjacent sides of two metacarpals (as bipennate muscles)

Question 37

Insertion of the dorsal interossei (1-4)

Answer 37

Bases of proximal phalanges | Extensor expansions of 2nd-4th fingers

Question 38

Innervation if the dorsal interossei (1-4)

Answer 38

Deep branch of the ulnar nerve (C8, T1)

Question 39

Actions of the dorsal interossei (1-4)

Answer 39

Abduct 2md-4th fingers from axial line | Act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints

Question 40

Origin of the palmar interossei (1-3)

Answer 40

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

Question 41

Insertion of the palmar interossei (1-3)

Answer 41

Bases of the proximal phalanges | Extensor expansions of the 2nd, 4th, and 5th fingers

Question 42

Innervation of the palmar interossei (1-3)

Answer 42

Deep branch of the ulnar nerve (C8, T1)

Question 43

Actions of the 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