OP Group 5

Question 1

Flexor Pollicis Longus - Origin

Answer 1

Radius (middle 1/3 anterior surface) and interosseous membrane

Question 2

Flexor Pollicis Longus - Insertion

Answer 2

Base of distal phalanx of thumb (anterior aspect)

Question 3

Flexor Pollicis Longus - Action

Answer 3

Flexion of thumb (CMC, MCP, IP joints); weak wrist flexion

Question 4

Flexor Pollicis Longus - Innervation

Answer 4

Median nerve

Question 5

Extensor Indicis - Origin

Answer 5

Posterior distal 1/3 of ulna and interosseous membrane

Question 6

Extensor Indicis - Insertion

Answer 6

Base of middle and distal phalanx of index finger (via extensor expansion & extensor digitorum muscle tendon)

Question 7

Extensor Indicis - Action

Answer 7

Extension of index finger (MCP, PIP, DIP); weak extension of hand and adduction of index finger

Question 8

Extensor Indicis - Innervation

Answer 8

Radial nerve

Question 9

Flexor Digiti Minimi - Origin

Answer 9

Flexor retinaculum and hook of hamate

Question 10

Flexor Digiti Minimi - Insertion

Answer 10

Base of proximal phalanx of little finger

Question 11

Flexor Digiti Minimi - Action

Answer 11

Flexion of little finger (CMC and MCP)

Question 12

Flexor Digiti Minimi - Innervation

Answer 12

Ulnar nerve

Question 13

Abductor Pollicis Longus - Origin

Answer 13

Posterior surfaces of ulna, radius and interosseous membrane (middle 1/3 of forearm)

Question 14

Abductor Pollicis Longus - Insertion

Answer 14

Base of 1st metacarpal (lateral side)

Question 15

Abductor Pollicis Longus - Action

Answer 15

Abduction of thumb (CMC joint); also assists with radial deviation of wrist, extension and rotation of thumb, and flexion/supination of hand at wrist

Question 16

Abductor Pollicis Longus - Innervation

Answer 16

Radial nerve

Question 17

Adductor Pollicis - Origin

Answer 17

Oblique head: capitate and bases of 2nd and 3rd metacarpals; Transverse head: palmar surface of 3rd metacarpal

Question 18

Adductor Pollicis - Insertion

Answer 18

Base of proximal phalanx of thumb

Question 19

Adductor Pollicis - Action

Answer 19

Adduction of thumb

Question 20

Adductor Pollicis - Innervation

Answer 20

Ulnar nerve

Question 21

Extensor Pollicis Longus - Origin

Answer 21

Posterior middle 1/3 of ulna and interosseous membrane

Question 22

Extensor Pollicis Longus - Insertion

Answer 22

Distal phalanx of thumb

Question 23

Extensor Pollicis Longus - Action

Answer 23

Extension of thumb (CMC, MCP, IP joints); assists in extension and radial flexion of wrist

Question 24

Extensor Pollicis Longus - Innervation

Answer 24

Radial nerve

Question 25

Flexor Pollicis Brevis - Origin

Answer 25

Trapezium and flexor retinaculum

Question 26

Flexor Pollicis Brevis - Insertion

Answer 26

Base of proximal phalanx of thumb

Question 27

Flexor Pollicis Brevis - Action

Answer 27

Flexion of thumb (CMC, MCP joint)

Question 28

Flexor Pollicis Brevis - Innervation

Answer 28

Median nerve

Question 29

Opponens Pollicis - Origin

Answer 29

Tubercle of trapezium and flexor retinaculum

Question 30

Opponens Pollicis - Insertion

Answer 30

Metacarpal of thumb (anteriolateral side)

Question 31

Opponens Pollicis - Action

Answer 31

Opposition of thumb (CMC joint)

Question 32

Opponens Pollicis - Innervation

Answer 32

Median and ulnar nerves