Muscles of forearm and hand

Question 1

Pronator Teres

Answer 1

O: humeral head: medial epicondyle and adjacent supra-epicondylar ridge

Ulnar head: medial border of coronoid process

I: mid-lateral surface of the radius

A: pronates forearm

Question 2

flexor carpi ulnaris - wrist flexors

Answer 2

O: humeral head: medial epicondyle of humerus

Ulnar head: medial border of olecranon and posterior border of upper 2/3 of ulna

I: pisiform bone, hook of hamate, base of 5th metacarpal

A: flexes and adducts wrist

Question 3

Palmaris Longus - wrist flexors

Answer 3

O: medial epicondyle of humerus

I: palmar aponeurosis of hand

A: flexes wrist joint. Tenses palmar fascia

Question 4

Flexor Carpi radialis - wrist flexors

Answer 4

O: medial epicondyle of humerus

I: bases of 2nd and 3rd metacarpals

A: flexes and abducts wrist joint

Question 5

Flexor digitorum superficiales - finger flexors

Answer 5

O: humero-ulnar head: medial epicondyle of humerus adjacent border of coronoid process

I: four tendons each divide into two slips, each of which inserts into the sides of the middle phalanges of the four fingers

A: flexes proximal interphalangeal joints of the index, middle, ring, and little fingers, can also flex metacarpophalangeal joints of the same fingers and the wrist joint

Question 6

flexor digitorum profundus - finger flexors

Answer 6

O: medial and anterior surfaces of ulna, medial half of interosseous membrane

I: four tendons which attach to the palmar surfaces of the distal phalanges of the index, middle, ring, and little fingers

A: flexes distal interphalangeal joints of the index, middle, ring, and little fingers; can also flex metacarppophalangeal joints of the same fingers and the wrist joint

Question 7

Flexor Pollicis longus - finger flexors

Answer 7

O: anterior surface of shaft of radius, radial half of interosseous membrane

I: palmar surface of base of distal phalanx of thumb

A: flexes interphalangeal joint of thumb, assists in flexion of metacarpophalangeal joint of thumb

Question 8

brachioradialis

Answer 8

O: proximal part of lateral supraepicondylar ridge of humerus and adjacent intermuscular septum

I: lower surface of distal end of radius just above styloid process

A: accessory flexor of elbow joint when forearm is midpronated

Question 9

supinator

Answer 9

O: superficial part: lateral epicondyle of humerus radial collateral and anular ligaments

Deep part: supinator crest of ulna

I: lateral surface of radius superior to the anterior oblique line

A: supination

Question 10

Extensor Carpi radialis longus - wrist extensors

Answer 10

O: distal part of lateral supraepicondylar ridge of humerus and adjacent intermuscular septum

I: dorsal surface of base of second metacarpal

A: extends and abducts wrist

Question 11

Extensor carpi radialis brevis - wrist extensors

Answer 11

O: lateral epicondyle of humerus and adjacent intermuscular septum

I: dorsal surface of base of second and third metacarpals

A: extends and adducts wrist

Question 12

extensor carpi ulnaris - wrist flexor

Answer 12

O: lateral epicondyle of humerus and posterior border of ulna

I: tubercle on base of medial side of fifth metacarpal

A: extends and adducts wrist

Question 13

Extensor digitorum - finger extensors

Answer 13

O: lateral epicondyle of humerus and adjacent intermuscular septum and deep fascia

I: four tendons which insert via extensor hoods into the dorsal aspects of the bases of middle and distal phalanges of the index, middle, ring, and little fingers

A: extends the index, middle, ring, and little fingers, can also extend the wrist

Question 14

Opponens Pollicis

Answer 14

O: flexor retinaculum tubercle of trapezium

I: entire length of radial border of first metacarpal

A: medially rotates thumb