Actions of Muscles of the Forearm

Question 1

What is the action of pronator teres?

Answer 1

pronates forearm and assists elbow flexion.

Question 2

What is the action of flexor carpi radialis?

Answer 2

flexes and radially deviates (abducts) the wrist.

Question 3

What is the action of palmaris longus?

Answer 3

flexes wrist and tightens palmar aponeurosis

Question 4

What is the action of flexor carpi ulnaris?

Answer 4

flexes and ulnarly deviates (adducts) the wrist.

Question 5

What is the action of flexor digitorum superficialis (FDS)?

Answer 5

flexes MCP and PIP joints of medial 4 digits, and assists in wrist flexion

Question 6

What is the action of flexor digitorum profundus (FDP)?

Answer 6

primarily flexes DIP and assists flexions of PIP, MCP joints of the medial 4 digits and assists wrist flexion.

Question 7

What is the action of flexor pollicis longus (FPL)?

Answer 7

flexes IP & MCP of the first digit

Question 8

What is the action of pronator quadratus?

Answer 8

pronates forearm

Question 9

What is the action of brachioradialis?

Answer 9

flexes forearm at elbow joint and rotates forearm to the midprone position

Question 10

What is the action of extensor carpi radialis longus?

Answer 10

extends and radially deviates (abducts) the wrist

Question 11

What is the action of extensor carpi radialis brevis?

Answer 11

extends and radially deviates the wrist

Question 12

What is the action of extensor digitorum?

Answer 12

extends medial 4 digits at MCP and IP joints and assists in wrist extension

Question 13

What is the action of extensor digiti minimi?

Answer 13

extends 5th digit at MCP and IP joints

Question 14

What is the action of extensor carpi ulnaris?

Answer 14

extends and ulnarly deviates the wrist

Question 15

What is the action of supinator?

Answer 15

supinates forearm and may assist in elbow flexion.

Question 16

What is the action of abductor pollicis longus?

Answer 16

abducts and extends thumb at carpometacarpal joint and abducts the wrist.

Question 17

What is the action of extensor pollicis longus?

Answer 17

extends IP joint of thumb and assists extension at the MCP joint.

Question 18

What is the action of extensor pollicis brevis?

Answer 18

extends MCP joint of the thumb.

Question 19

What is the action of extensor indicis?

Answer 19

extends 2nd digit at the MCP and IP joints

Question 20

What is the action of abductor pollicis brevis?

Answer 20

abducts 1st digit at CMC joint.

Question 21

What is the action of opponens pollicis?

Answer 21

opposition of the first digit at the CMC joint

Question 22

What is the action of flexor pollicis brevis?

Answer 22

flexes first digit at the MCP and CMC joints.

Question 23

What is the action of adductor pollicis?

Answer 23

adducts first digit and assists with flexion at MCP and CMC joint.

Question 24

What is the action of palmaris brevis?

Answer 24

draws skin toward middle of palm.

Question 25

What is the action of abductor digiti minimi?

Answer 25

abducts 5th digit at MCP joint.

Question 26

What is the action of flexor digiti minimi brevis?

Answer 26

flexes 5th digit at the MCP joint.

Question 27

What is the action of opponens digiti minimi?

Answer 27

opposition of 5th digit at CMC joint.

Question 28

What is the action of lumbricales?

Answer 28

flexes at MCP joints and extends at IP joints.

Question 29

What is the action of dorsal interosseii?

Answer 29

abducts digits, flexes at MCP joints and extends at IP joints.

Question 30

What is the action of palmar interosseii?

Answer 30

adduct digits and flexes MCP joints and extends at IP joints.