Hand

Question 1

origin of abductor pollicis brevis

Answer 1

scaphoid and trapezium; flexor retinaculum

Question 2

insertion of abductor pollicis brevis

Answer 2

base of the proximal phalanx of the thumb (via the radial sesamoid)

Question 3

innervation of abductor pollicis brevis

Answer 3

median n. (C8,T1)

Question 4

action of abductor pollicis brevis

Answer 4

abducts the CMC joint of thumb

Question 5

origin of flexor pollicis brevis

Answer 5

superficial head: flexor retinaculum

deep head: capitate, trapezium

Question 6

insertion of flexor pollicis brevis

Answer 6

base of the proximal phalanx of the thumb (via the radial sesamoid)

Question 7

innervation of flexor pollicis brevis

Answer 7

superficial head: median n. (C8,T1)

deep head: ulnar n. (C8,T1)

Question 8

action of flexor pollicis brevis

Answer 8

flexes the CMC joint of thumb

Question 9

origin of opponens pollicis

Answer 9

trapezium

Question 10

insertion of opponens pollicis

Answer 10

radial border of the first metacarpal

Question 11

innervationof opponens pollicis

Answer 11

median

Question 12

action of opponens pollicis

Answer 12

opposition of CMC joint of thumb

Question 13

origin of abductor digiti minimi

Answer 13

pisiform bone

Question 14

insertion of abductor digiti minimi

Answer 14

ulnar base of the 5th proximal phalanx, and dorsal digital expansion of 5th digit

Question 15

innervation of abductor digiti minimi

Answer 15

deep ulnar n. (C8,T1)

Question 16

action of abductor digiti minimi

Answer 16

MCP joint: flexion and abduction of little finger

PIP and DIP joints: extension

Question 17

origin of flexor digiti minimi brevis

Answer 17

hook of hamate, flexor retinaculum

Question 18

insertion of flexor digiti minimi brevis

Answer 18

base of the 5th proximal phalanx

Question 19

innervation of flexor digiti minimi brevis

Answer 19

deep ulnar n. (C8,T1)

Question 20

action of flexor digiti minimi brevis

Answer 20

flexion of MCP joint of little finger

Question 21

insertion of opponens digiti minimi

Answer 21

ulnar border of 5th metacarpal

Question 22

innervation of opponens digiti minimi

Answer 22

deep ulnar n. (C8,T1)

Question 23

action of opponens digiti minimi

Answer 23

draws metacarpal in palmar direction (opposition)

Question 24

origin of opponens digiti minimi

Answer 24

hook of hamate, flexor retinaculum

Question 25

origin of lumbricals

Answer 25

1st and 2nd muscles: radial sides of the tendons of flexor digitorum profundus 3rd and 4th muscles: bipennate from medial and lateral sides of the tendons of flexor digitorum profundus

Question 26

insertion of lumbricals

Answer 26

1st muscles inserts on the 2nd digit dde (dorsal digital expansion) 2nd muscle on 3rd digit dde 3rd muscle on 4th digit dde 4th muscle on 5th digit dde

Question 27

innervation of lumbricals

Answer 27

1st and 2nd muscles: median n. 3rd and 4th muscles: ulnar n.

Question 28

action of lumbricals

Answer 28

2nd to 5th digits: MCP joints: flexion PIP and DIP joints: extension

Question 29

origin of dorsal interossei

Answer 29

1st muscles originates on the 1st and 2nd metacarpals (adjacent sides, two heads) 2nd muscle on 2nd & 3rd metacarpals 3rd muscle on 3rd & 4th metacarpals 4th muscle on 4th & 5th metacarpals

Question 30

insertion of dorsal interossei

Answer 30

1st muscles inserts on the 2nd digit dde (dorsal digital expansion); radial side of 2nd proximal phalanx 2nd muscle on 3rd digit dde; radial side of 3rd proximal phalanx 3rd muscle on 3rd digit dd; ulnar side of 3rd proximal phalanx 4th muscle on 4th digit dde; ulnar side of 4th proximal phalanx

Question 31

innervation of dorsal interossei

Answer 31

deep ulnar n. (C8,T1)

Question 32

action of dorsal interossei

Answer 32

2nd to 4th digits: MCP joints: flexion PIP and DIP joints: extension and abduction from 3rd digit

Question 33

origin of 1st palmar interossei

Answer 33

2nd metacarpal (ulnar side)

Question 34

origin of 2nd palmar interossei

Answer 34

4th metacarpal (radial side)

Question 35

origin of 3rd palmar interossei

Answer 35

5th metacarpal (radial side)

Question 36

insertion of 1st palmar interossei

Answer 36

base of 2nd proximal phalanx

Question 37

insertion of 2nd palmar interossei

Answer 37

base of 4th proximal phalanx

Question 38

insertion of 3rd palmar interossei

Answer 38

base of 5th proximal phalanx

Question 39

innervation of palmar interossei

Answer 39

deep ulnar n.

Question 40

action of palmar interossei

Answer 40

2nd,4th,5th digits: MCP joints: flexion PIP and DIP joints: extension and adduction toward 3rd digit