Muscles of the Thumb

Question 1

what are the attachments of abductor pollicis longus?

Answer 1

O: middle part of posterior surface of radius and ulna & interosseous membrane

I: dorsal base of proximal phalanx of thumb

Question 2

what is the nerve supply of abductor pollicis longus?

Answer 2

posterior interosseous branch of radial nerve -C7,8

Question 3

what is the action of abductor pollicis longus?

Answer 3

abducts the thumb

Question 4

what is the function of the abductor pollicis longus?

Answer 4

opening hand to grip large object

Question 5

What are the attachments of extensor pollicis longus?

Answer 5

O: middle 1/3rd posterior surface of ulna and adjacent interosseous membrane

I: dorsal surface of base of distal phalanx of thumb

Question 6

What is the nerve supply to extensor pollicis longus?

Answer 6

posterior interosseous branch of radial nerve - C7, c8

Question 7

what is the action of extensor pollicis longus?

Answer 7

extends 1st IP, MCP, CMC and wrist joint abducts the wrist

Question 8

what is the function of extensor pollicis longus?

Answer 8

releasing grip

Question 9

what are the attachments of extensor pollucis brevis?

Answer 9

O: middle 1/3 posterior surface of radius and interosseous membrane

I: dorsal surface base of proximal phalanx of thumb

Question 10

what is the nerve supply of extensor pollicis brevis?

Answer 10

posterior interosseous nerve C7, C8

Question 11

what is the action of extensor pollucis brevis?

Answer 11

Extends CMC and MCP joints of thumb

Helps to extend and abduct wrist

Question 12

what is a function of extensor pollucis brevis?

Answer 12

release of grip

Question 13

What are the attachments of flexor pollucis longus?

Answer 13

O: anterior surface of radius - between radial tuberosity and pronator quadratus & adjacent interosseous membrane

I: palmar surface of base of distal phalanx of thumb

Question 14

what is the nerve supply of flexor pollucis longus?

Answer 14

Anterior interosseous branch of median nerve C8, T1

Question 15

what is the action of flexor pollucis longus?

Answer 15

Flexion of the IP joint @ thumb

Flexes MCP and wrist

Question 16

Functional activity of flexor polluclis longus?

Answer 16

Gripping small object

Question 17

What are the attachments of Abductor Pollucis Brevis?

Answer 17

O: Flexor retinaculum, scaphoid tubercles and tubercle on trapezium

I: to radial side of base of proximal phalanx of thumb - via DDE of extensor pollucis longus

Question 18

What are the attachments of Flexor Pollicis Brevis?

Answer 18

O: flexor retinaculum, tubercle of trapezium, capitate and trapezoid

I: radial side of base of proximal phalanx of thumb

Question 19

What are the attachments of Opponens pollucis?

Answer 19

O: flexor retinaculum and tubercle of trapezium

I: lateral half of anterior surface of 1st metacarpal

Question 20

what is the action of abductor pollicis brevis?

Answer 20

abduction at 1st CMC and MCP joint

Question 21

what is the action of the flexor pollicis brevis muscle?

Answer 21

flexion at the 1st MCP and CMC joint

Question 22

what is the action of the opponens pollicis muscle?

Answer 22

medial rotation of the 1st metacarpal during opposition

Question 23

Nerve supply of abductor pollicis brevis

Answer 23

median nerve t1

Question 24

nerve supply to flexor pollucis brevis

Answer 24

median nerve t1

Question 25

nerve supply to opponens pollicis

Answer 25

median nerve t1

Question 26

function of abductor pollicis brevis

Answer 26

gripping

Question 27

function of flexor pollicis brevis

Answer 27

gripping

Question 28

function of opponens pollicis

Answer 28

precision gripping