Muscles of Wrist

Question 1

Pronator Quadratus

Answer 1

Inn: medial nerve
O: distal quarter of anterior ulna
Ins: distal quarter of anterior radius

Pronation of forearm

Question 2

Flexor Pollicis Longus

Answer 2

Inn: median nerve
O: anterior radius and interosseous membrane
Ins: anterior base of distal phalanx and thumb

Flexion of the thumb

Question 3

Abductor Pollicis Longus

Answer 3

Inn: radial nerve
O: posterior mid radius, ulna, and interosseous membrane
Ins: dorsum of base of 1st metacarpal

Abduction of the thumb and wrist

Question 4

Extensor Pollicis Brevis

Answer 4

Inn: radial nerve
O: posterior mid radius and interosseous membrane
Ins: dorsum of base of proximal phalanx of thumb

Extension and abduction of thumb

Question 5

Extensor Pollicus Longus

Answer 5

Inn: radial nerve
O: posterior mid ulna and interosseous membrane
Ins: dorsum of base of distal phalanx of thumb

Question 6

Extensor Carpi Radialis Longus

Answer 6

Inn: radial nerve
O: lateral humeral epicondyle and lateral humeral supracondylar ridge
Ins: posterior base of 2nd metacarpal

Extension and abduction (radial deviation) of wrist

Question 7

Extensor Carpi Radialis Brevis

Answer 7

Inn: deep radial nerve
O: lateral humeral epicondyle
Ins: posterior base of 3rd metacarpal

Extension and abduction (radial deviation) of wrist

Question 8

Extensor Digitorum

Answer 8

Inn: radial nerve
O: lateral humeral epicondyle
Ins: posterior 2nd-5th middle and distal phalanges

Extends 2nd-5th middle and distal phalanges and extends 2nd-5th proximal phalanges and hand by continued action

Question 9

Extensor Indicis

Answer 9

Inn: radial nerve
O: posterior distal half of ulna
Ins: index finger extensor digitorum tendon

Extension of index finger

Question 10

Extensor Digiti Minimi

Answer 10

Inn: radial nerve
O: extensor digitorum tendon in forearm
Ins: little finger extensor digitorum tendon

Extension of little finger

Question 11

Flexor Digitorum Profundus

Answer 11

Inn: Median and ulnar nerve
O: Anterior, medial ulna
Ins: Bases of distal phalanges of fingers

Flexion of distal phalanges of each finger