Forearm and wrist

Question 1

Pronator teres attachments and actions

Answer 1

-superior medial epicondyle, coronoid process

-middle part of lateral radius

Actions:
pronation of forearm
weak flexion of forearm

Question 2

Flexor carpi radialis attachments and actions

Answer 2

*medial epicondyle of humerus

*base of 2nd metacarpal

Actions:
flexes hand at wrist
abducts hand at wrist

Question 3

Palmaris longus attachments and actions

Answer 3

*medial epicondyle of humerus

*flexor retinaculum, palmar aponeurosis

Actions:
flexes hand at wrist (weakly)
tenses palmar aponeurosis

Question 4

Flexor carpi ulnaris attachments and actions

Answer 4

*humeral head: medial epicondyle
*ulnar head: olecranon and posterior border

*pisiform, hamate, 5th metacarpal

Actions:
flexes hand at wrist
adducts hand at wrist

Question 5

Flexor digitorum superficialis attachments and actions

Answer 5

*humeroulnar head: medial epicondyle of humerus, coronoid process
*radial head: superior half of anterior border of radius

*shafts of middle phalanges 2 - 5

Actions:
flexes middle and proximal phalanges

Question 6

Flexor digitorum profundus attachments and actions

Answer 6

*proximal 3/4 of anterior and medial aspect of ulna, interosseus membrane

*bases of distal phalanges of digits 2 – 5

Actions:
flexes distal phalanges

Question 6

Flexor pollicis longus attachments and actions

Answer 6

*anterior surface of radius and interosseus membrane

*base of 1st distal phalanx

Actions:
flexion of phalanges of digit 1

Question 7

Pronator quadratus attachments and actions

Answer 7

*distal 1/4 of anterior surface of ulna

*distal 1/4 of anterior surface of radius

Actions:
pronation of forearm

Question 8

Brachioradialis attachments and actions

Answer 8

*proximal 2/3 of lateral supracondylar ridge

*lateral, distal radius, proximal to styloid process

Actions:
flexion of forearm at elbow

Question 9

Extensor Carpi Radialis Longus attachments and actions

Answer 9

*lateral supracondylar ridge

*base of 2nd metacarpal

extension of hand at wrist
abduction of hand at wrist

Question 10

Extensor Carpi Radialis Brevis attachments and actions

Answer 10

*lateral epicondyle

*base of 3rd metacarpal

Actions:
extension of hand at wrist
abduction of hand at wrist

Question 11

Extensor Digitorum attachments and actions

Answer 11

*lateral epicondyle of humerus

*extensor expansion of digits 2-5

Actions:
extension of digits 2-5

Question 12

Extensor Digiti Minimi attachments and actions

Answer 12

*lateral epicondyle of humerus

*extensor expansion of digit 5

Actions:
extends digit 5

Question 13

Extensor Carpi Ulnaris attachments and actions

Answer 13

*lateral epicondyle of humerus and posterior border of ulna

*base of 5th metacarpal

Actions:
extends hand at wrist
adducts hand at wrist

Question 14

Supinator attachments and actions

Answer 14

*lateral epicondyle of humerus, radial collateral ligament, annular ligament, supinator fossa, crest of ulna

*lateral, anterior and posterior surfaces of proximal third of radius

Actions:
supination of forearm

Question 14

Anconeus attachments and actions

Answer 14

*lateral epicondyle of humerus

*lateral surface of olecranon and superior, posterior surface of ulna

Actions:
assists in extension of the forearm at the elbow

Question 14

Extensor Pollicis Brevis attachments and actions

Answer 14

*posterior surface of radius and interosseous membrane

*base of 1st proximal phalanx

Question 15

Abductor Pollicis Longus attachments and actions

Answer 15

*posterior surfaces of radius, ulna and interosseous membrane

*base of 1st metacarpal

Actions:
abducts 1st digit at carpometacarpal joint
extends 1st digit at carpometacarpal joint

Question 16

Extensor Pollicis Longus attachments and actions

Answer 16

*posterior surface of ulna and interosseous membrane

*base of 1st distal phalanx

Actions:
extension of 1st proximal phalanx

Actions:
extends distal phalanx of 1st digit
extends 1st proximal phalanx and 1st metacarpal

Question 17

Extensor Indicis attachments and actions

Answer 17

*posterior surface of ulna and interosseous membrane

*extensor expansion of 2nd digit

Actions:
extends 2nd digit
assists extension of hand at wrist