Thenar muscles

Question 1

Origin of opponens pollicis

Answer 1

Tubercle of trapezium and associated flexor retinaculum

Question 2

Attachment of opponens pollicis

Answer 2

Lateral margin of metacarpal of thumb

Question 3

Action of opponens pollicis

Answer 3

Opposes thumb by medial rotation and flexion of the metacarpal of thumb

Question 4

Innervation of Thenar muscles

Answer 4

Median nerve

Question 5

Origin of abductor pollicis brevis

Answer 5

Tubercles of scaphoid and trapezium and associated flexor retinaculum

Question 6

Attachment of abductor pollicis brevis

Answer 6

Lateral side of proximal phalanx of thumb

Question 7

Action of abductor pollicis brevis

Answer 7

Abducts thumb

Question 8

Origin of flexor pollicis brevis

Answer 8

Tubercle of trapezium and associated flexor retinaculum

Question 9

Attachment of flexor pollicis brevis

Answer 9

Base of proximal phalanx of thumb

Question 10

Action of flexor pollicis brevis

Answer 10

Flexes MCP joint of thumb

Question 11

What are the Thenar muscles

Answer 11

Opponens pollicis,
Abductor pollicis brevis,
Flexor pollicis brevis

Question 12

What’s the Thenar eminence

Answer 12

Bulge produced by Thenar muscle bellies