Thenar muscles

Question 1

Insertion of abductor pollicis brevis?

Answer 1

Thumb (base of proximal phalanx)

Via the radial sesamoid

Question 2

Innervation of abductor pollicis brevis?

Answer 2

Recurrent Branch of Median nerve

C8,T1

Question 3

Action of abductor pollicis brevis?

Answer 3

CMC joint of thumb: abduction

Question 4

Origin of flexor pollicis brevis? (2)

Answer 4

Superficial head: flexor retinaculum

Deep head: capitate bone, trapezium

Question 5

Insertion of flexor pollicis brevis?

Answer 5

Thumb (base of proximal phalanx)

via the radial sesamoid

Question 6

Innervation of flexor pollicis brevis? (2 heads)?

Answer 6

Superficial head: Recurrent Branch of median n. (C8, T1)

Deep head: deep ulnar n. (C8, T1)

Question 7

Action of flexor pollicis brevis?

Answer 7

CMC joint of thumb: flexion

Question 8

Origin of the opponens pollicis?

Answer 8

Trapezium

Question 9

Insertion of opponens pollicis?

Answer 9

First metacarpal (radial border)

Question 10

Innervation of opponens pollicis?

Answer 10

recurrent branch of Median n.

Question 11

Action of opponens pollicis?

Answer 11

CMC joint of thumb: opposition

Question 12

Origin of abductor pollicis brevis?

Answer 12

Scaphoid bone and trapezium, flexor retinaculum

Question 13

Origin of Adductor pollicis? (2 heads)

Answer 13

Transverse head: 3rd metacarpal (palmar surface)

Oblique head: capitate bone, 2nd and 3rd metacarpals (bases)

Question 14

Insertion of Adductor Pollicis?

Answer 14

thumb (base of proximal phalanx) via the ulnar sesamoid

Question 15

Innervation of Adductor Pollicis?

Answer 15

deep ulnar n. (C8-T1)

Question 16

Action of Adductor Pollicis?

Answer 16

CMC joint of thumb: adduction

MCP joint of thumb: flexion