Thenar Muscles Of Hand

Question 1

What are the thenar muscles? (3)

Answer 1

Opponens pollicis, abductor pollicis brevis, flexor pollicis brevis

Question 2

Origin of opponens pollicis

Answer 2

Tubercle of trapezium + associated flexor retinaculum

Question 3

Insertion of opponens pollicis

Answer 3

Lateral margin of 1st metacarpal

Question 4

Action of opponens pollicis

Answer 4

Opposes the thumb

Question 5

Innervation of opponens pollicis

Answer 5

Median nerve

Question 6

Origin of abductor pollicis brevis

Answer 6

Tubercle of scaphoid and trapezium

Question 7

Insertion of abductor pollicis brevis

Answer 7

Lateral side of proximal phalanx of thumb

Question 8

Action of abductor pollicis brevis

Answer 8

Abducts the thumb

Question 9

Innervation of abductor pollicis brevis

Answer 9

Median nerve

Question 10

Origin of flexor pollicis brevis

Answer 10

Tubercle of trapezium

Question 11

Insertion of flexor pollicis brevis

Answer 11

Base of proximal phalanx of thumb

Question 12

Action of flexor pollicis brevis

Answer 12

Flexes MCPJ of thumb

Question 13

Innervation of flexor pollicis brevis

Answer 13

Median nerve, deep head by ulnar nerve