Thenar Eminence

Question 1

Abductor pollicis brevis - origin

Answer 1

1. Tubercle of scaphoid
2. Tubercle of trapezium
3. Flexor retinaculum

Question 2

Abductor pollicis breivs - insertion

Answer 2

Lateral side of base of proximal phalanx of thumb via dorsal digital expansion

Question 3

Abductor pollicis brevis - actions

Answer 3

1. Abduction of thumb at CMC joint
2. Flexion of thum at MCP joint
3. Extension of thumb at CMC and IP joints

Question 4

Abductor pollicis brevis - innervation

Answer 4

Median nerve

Question 5

Abductor pollicis brevis - arterial supply

Answer 5

Branches of radial artery

Question 6

Flexor pollicis brevis - origin

Answer 6

1. Trapezium

2. Flexor retinaculum

Question 7

Flexor pollicis brevis - insertion

Answer 7

Lateral side of base of proximal phalanx of thumb

Question 8

Flexor pollicis brevis - actions

Answer 8

1. Flexion of thumb at CMC and MCP joints

2. Abduction of thumb at CMC joint

Question 9

Flexor pollicis brevis - innervation

Answer 9

Median and ulnar nerves

Question 10

Flexor pollicis brevis - arterial supply

Answer 10

Branches of radial artery

Question 11

Opponens pollicis - origin

Answer 11

1. Tubercle of trapezium

2. Flexor retunaculum

Question 12

Opponens pollicis - insertion

Answer 12

Anterior surface of lateral side of 1st metacarpal

Question 13

Opponens pollicis - actions

Answer 13

1. Opposition of thumb at CMC joint
2. Flexion of thumb at CMC joint
3. Medial rotation of thumb at CMC joint
4. Abduction of thumb at CMC joint

Question 14

Opponens pollicis - innervation

Answer 14

Median and ulnar nerves

Question 15

Opponens pollicis - arterial supply

Answer 15

Branches of radial artery