Organization of the Forearm

Question 1

muscles of superficial flexor forearm

Answer 1

pronator teres
flexor carpi radialis
palmaris longus
flexor carpi ulnaris

Question 2

attachments of pronator teres?

Answer 2

origin:
humeral head - medial epicondyle by common flexor tendon
ulnar head - coronoid process of ulna

insertion:
lateral surface, middle portion of shaft of radius

Question 3

action of pronator teres

Answer 3

pronates and slightly flexes forearm

Question 4

innervation of pronator teres

Answer 4

median nerve

Question 5

attachments of flexor carpi radialis?

Answer 5

origin:
medial epicondyle of humerus by common flexor tendon

insertion:
base of 2nd and 3rd metacarpal

Question 6

action of flexor carpi radialis?

Answer 6

flexes wrist and abducts band

Question 7

innervation of flexor capri radialis?

Answer 7

median nerve

Question 8

attachments of palmaris longus?

Answer 8

origin:
medial epicondyle of humerus by common flexor tendon

insertion:
palmar aponeurosis

Question 9

action of palmaris longus?

Answer 9

flexes wrist

Question 10

innervation of palmaris longus?

Answer 10

median nerve

Question 11

attachments of flexor carpi ulnaris?

Answer 11

origin:
humeral head - medial epicondyle of humerus
ulnar head - medial border of olecranon process and proximal dorsal surface of ulna

insertion:
pisiform, hamulus of hamate, base of 5th metacarpal

Question 12

action of flexor carpi ulnaris?

Answer 12

flexes wrist, adducts hand

Question 13

innervation of flexor carpi ulnaris

Answer 13

ulnar nerve

Question 14

muscles of intermediate layer flexor compartment?

Answer 14

flexor digitorum superficialis

Question 15

formation of carpal tunnel

Answer 15

flexor retinaculum deep fascia attached to trapezium, scaphoid, pisiform, and hamulus of hamate

Question 16

contents of carpal tunnel?

Answer 16

median nerve

tendons of intermediate and deep flexor muscles

Question 17

attachments of flexor digitorum superficilais

Answer 17

origin:
humeroulnar head - medial epicondyle of humerus and coronoid process of ulna
radial head - proximal one-half, anterior border radius

insertion:
palmar aspect of middle phalanges, digit 2-5

Question 18

action of flexor digitorum superficialis

Answer 18

flexes proximal IP joints, assist in flexion of MP joints, wrist, forearm

Question 19

innervation of flexor digitorum superficialis

Answer 19

median nerve

Question 20

muscles of deep layer flexor compartment

Answer 20

flexor digitorum profundus and flexor pollicis longus

Question 21

attachments of flexor digitorum profundus

Answer 21

origin:
proximal 2/3 of medial anterior surface of ulna adjacent interosseous membrane

insertion:
palmar surface of distal phalanges, digit 2-5

Question 22

action of flexor digitorum profundus

Answer 22

flexion of distal IP joints, assist flexion of proximal IP joints, MP and wrist joints

Question 23

innervation of flexor digitorum profundus

Answer 23

lateral portion (4 5) - median nerve
medial portion(2 3) - ulnar nerve

Question 24

attachments of flexor pollicis longus

Answer 24

origin:
ulna (near medial border of coronoid process), anterior surface of radius (between oblique line and pronator quadratus), adjacent interosseous membrane

insertion:
palmar surface, base of distal phalanx of thumb

Question 25

action of flexor pollicis longus?

Answer 25

flexes thumb

Question 26

innervation of flexor pollicis longus?

Answer 26

median nerve

Question 27

attachments of pronator quadratus

Answer 27

origin: distal one fourth of anterior surface of ulna insertion: dostal one fourth of anterior surface of radius

Question 28

action of pronator quadratus

Answer 28

pronator

Question 29

innervation of pronator quadratus

Answer 29

median nerve

Question 30

muscles of superficial extensor compartment?

Answer 30

``` extensor carpi radialis longus extensor carpi radialis brevis extensor digitorum extensor digiti minimi extensor carpi ulnaris ```

Question 31

attachments of extensor carpi radialis longus?

Answer 31

origin: lateral supracondylar ridge of humerus insertion: dorsal surface, base of second metacarpal

Question 32

action of extensor carpi radialis longus?

Answer 32

extends and abducts hand

Question 33

innervation of extensor carpi radialis longus?

Answer 33

radial nerve

Question 34

attachment of extensor carpi radialis brevis?

Answer 34

origin: lateral epicondyle of humerus insertion: dorsal surface, base of third metacarpal

Question 35

action of extensor carpi radialis brevis?

Answer 35

extend and assist in abduction of hand

Question 36

innervation of extensor carpi radialis brevis?

Answer 36

radial nerve

Question 37

attachments of extensor digitorum?

Answer 37

origin: lateral epicondyle of humerus insertion: dorsal surface of middle and distal phalanges of digits 2-5

Question 38

action of extensor digitorum

Answer 38

extend digits 2-5 and assist in extension of hand

Question 39

innervation of extensor digitorum

Answer 39

radial nerve

Question 40

intertendinous tendons

Answer 40

unite tendons of extensor digitorum as they cross dorsum of the hand

Question 41

extensor expansion

Answer 41

spans dorsum of proximal, middle, and distal phalanges distributes force site of attachment for lumbricals and interossei

Question 42

attachment of extensor digiti minimi

Answer 42

origin: lateral epicondyle of humerus in common with extensor digitorum insertion: dorsal surface, proximal phalanx of fifth digit (into extensor expansion)

Question 43

action of extensor digiti minimi

Answer 43

extension of fifth digit

Question 44

innervation of extnesor digit minimi

Answer 44

radial nerve

Question 45

attachments of extensor carpi ulnaris

Answer 45

origin: lateral epicondyle of humerus and posterior border of ulna insertion: base of fifth metacarpal

Question 46

action of extensor carpi ulnaris

Answer 46

extend and adducts hand

Question 47

innervation of extensor carpi ulnaris

Answer 47

radial nerve

Question 48

muscle of deep layer of extensor forearm compartment

Answer 48

``` abductor pollicis longus extensor pollicis brevis extensor pollicis longus extensor indicis supinator ```

Question 49

attachments of abductor pollicis longus?

Answer 49

origin: middle third posterior surface ulna, radius, and interosseous membrane insertion: dorsolateral surface, base of 1st metacarpal

Question 50

action of abductor pollicis longus

Answer 50

abducts of the thumb and wrist, assists in extension of thumb

Question 51

innervation of abductor pollicis longus

Answer 51

radial nerve

Question 52

attachments of extensor pollicis brevis

Answer 52

origin: distal third posterior surface of radius and interosseous membrane insertion: dorsal surface, base of proximal phalanx of thumb

Question 53

action of extensor pollicis brevis

Answer 53

extends proximal phalanx of thumb and first metacarpal

Question 54

innervation of extensor pollicis brevis

Answer 54

radial nerve

Question 55

attachments of extensor pollicis longus

Answer 55

origin: middle third posterior surface of ulna and interosseous membrane insertion: dorsal surface, base of distal phalanx of thumb

Question 56

action of extensor pollicis longus?

Answer 56

extends thumb (IP and MP joints)

Question 57

innervation of extensor pollicis longus?

Answer 57

radial nerve

Question 58

attachments of extensor indicis?

Answer 58

origin: distal third, posterior surface of ulna and interosseous membrane insertion: dorsum, base of distal phalanx of 2nd digit with extensor expansion

Question 59

action of extensor indicis?

Answer 59

extends index finger

Question 60

innervation of extensor indicis?

Answer 60

radial nerve

Question 61

extensor retinaculum

Answer 61

encloses 9 muscles of extensor forearm

Question 62

attachments of supinator?

Answer 62

origin: lateral epicondyle of humerus, radial collateral ligament of elbow joint, annular ligament of radial head, supinator fossa of ulna and associated crest insertion: lateral and anterior surface of proximal third of radius

Question 63

action of supinator?

Answer 63

supinates hand

Question 64

innervation of supinator?

Answer 64

radial nerve