Muscles of Forearm and Hand Origins

Question 1

Extensor Carpi radialis and brevis origin

Answer 1

Common extensor origin (lateral epicondyle of the humerus)

Question 2

Extensor digitorum origin

Answer 2

Common extensor origin (lateral epicondyle of the humerus)

Question 3

Extensor digiti minimi origin

Answer 3

Ulnar side of the belly of extensor digitorum

Question 4

Extensor carpi ulnaris origin

Answer 4

Common extensor origin (lateral epicondyle of the humerus)

Question 5

Abductor pollicis longus origin

Answer 5

• posterior surface of the middle part of the radius and ulna
• adjacent interosseous membrane

Question 6

Extensor pollicis brevis origin

Answer 6

• posterior surface of the middle part of the radius and ulna
• adjacent interosseous membrane

Question 7

Extensor pollicis longus origin

Answer 7

• posterior surface of the middle part of the radius and ulna
• adjacent interosseous membrane

Question 8

Extensor indicis origin

Answer 8

• posterior surface of the middle part of the radius and ulna
• adjacent interosseous membrane

Question 9

Supinator origin

Answer 9

Lateral epicondyle of the humerus and supinator crest of the ulnar

Question 10

Pronator teres origin (humeral head)

Answer 10

medial epicondyle

Question 11

Pronator teres origin (ulnar head)

Answer 11

medial to the tuberosity of ulnar

Question 12

Flexor carpi radialis origin

Answer 12

common flexor origin (medial epicondyle of the humerus)

Question 13

Palmaris longus origin

Answer 13

common flexor origin (medial epicondyle of the humerus)

Question 14

Flexor carpi ulnaris (humeral head) origin

Answer 14

common flexor origin (medial epicondyle of the humerus)

Question 15

Flexor carpi ulnaris (ulnar head) origin

Answer 15

posterior border of the middle one third of the ulna

Question 16

Flexor digitorum superficialis (humeroulnar head) origin

Answer 16

• common flexor origin (medial epicondyle of the humerus)
• medial side of the coronoid process of the ulna

Question 17

Flexor digitorum superficialis (radial head) origin

Answer 17

oblique line just distal and lateral to the bicipital tuberosity

Question 18

Flexor pollicis longus origin

Answer 18

• Middle part of the anterior surface of the radius
• Adjacent interosseous membrane

Question 19

Flexor digitorum profundus origin

Answer 19

• Proximal 3/4 of the medial side of the ulna
• Adjacent interosseous membrane

Question 20

Pronator Quadratus origin

Answer 20

Anterior surface of distal ulna

Question 21

Abductor pollicis brevis origin

Answer 21

palmar tubercles of the trapezium and scaphoid

Question 22

flexor pollicis brevis origin

Answer 22

transverse carpal ligament and palmar tubercle of trapezium

Question 23

Opponens pollicis origin

Answer 23

transverse carpal ligament and palmar tubercle of trapezium

Question 24

Abductor pollicis (oblique head) origin

Answer 24

• capitate bone
• base of second and third metacarpal

Question 25

Abductor pollicis (transverse head) origin

Answer 25

palmar surface of 3rd metacarpal

Question 26

Abductor digiti minimi origin

Answer 26

• pisiform bone
• tendon of the flexor carpi ulnaris

Question 27

Flexor digiti minimi origin

Answer 27

Hook of hamate

Question 28

opponens digiti minimi origin

Answer 28

• transverse carpal ligement
• hook of hamate

Question 29

First and second lumbricals origin

Answer 29

radial surface of the flexor profundus tendon of the index and middle fingers

Question 30

Third lumbrical origin

Answer 30

Adjacent sides of the flexor profundus tendons of the middle and ring fingers

Question 31

Fourth lumbrical origin

Answer 31

adjacent sides of the flexor profundus tendons of the ring and little fingers

Question 32

First dorsal interossei origin

Answer 32

adjacent sides of the first and second metacarpal

Question 33

Second dorsal interossei origin

Answer 33

adjacent sides of second and third metacarpal

Question 34

Third dorsal interossei origin

Answer 34

adjacent sides of third and fourth metacarpals

Question 35

fourth dorsal interossei origin

Answer 35

adjacent sides of the fourth and fifth metacarpal

Question 36

first palmar interossei origin

Answer 36

ulnar side of thumb metacarpal

Question 37

second palmar interossei origin

Answer 37

ulnar side of second metacarpal

Question 38

third palmar interossei origin

Answer 38

radial side of the fourth metacarpal

Question 39

fourth palmar interossei origin

Answer 39

radial side of the fifth metacarpal