Anatomy (Extensor Forearm And Hand)

Front 1

what are the borders of the extensor compartment of the forearm?

Back 1

medial border - subcutaneous border of ulna and ulnar border of hand

lateral border - radial artery in forearm and radial border of hand

Front 2

between what tendons is the anatomical snuffbox located?

Back 2

extensor pollicis longus

extensor pollicis brevis
abductor pollicis longus

Front 3

what crosses the anatomical snuffbox superficially?

Back 3

cephalic vein
superficial radial nerve

Front 4

what are the attachments of the supinator?

Back 4

lateral ligaments of the elbow
adjacent to radial notch of ulna

body of radius between anterior and posterior oblique lines

Front 5

what innervates the supinator muscle?

Back 5

deep radial nerve

Front 6

what are the actions of the supinator muscle?

Back 6

fixes forearm in supination (when forearm is flexed)
weakly supinates forearm when forearm is extended

Front 7

what is the strongest supinator of the forearm?

Back 7

biceps brachii

Front 8

what nerve passes between the two origins of the supinator?

Back 8

deep radial nerve
(becomes posterior interosseous nerve afterwards)

Front 9

what muscles are innervated by the posterior interosseous nerve?

Back 9

brachioradialis
extensor carpi radialis longus
extensor carpi radialis brevis

Front 10

what are the muscles in the lateral group of the extensor compartment?

Back 10

brachioradialis
extensor carpi radialis longus
extensor carpi radialis brevis

Front 11

what innervates the muscles in the lateral group of the extensor compartment of the forearm?

Back 11

posterior interosseous nerve

Front 12

what is the path of the deep radial nerve?

Back 12

from anterior aspect of capsule of elbow joint, deep to brachioradialis

around radius, through supinator

becomes posterior interosseous nerve

Front 13

from where is the common origin of all of the forearm extensors?

Back 13

common extensor tendon attached to the front of the lateral epicondyle, adjacent fascia, and supracondylar ridge

Front 14

what are the attachments of the extensor carpi radialis longus?

Back 14

inferior 1/3 of supracondylar ridge
lateral intermuscular septum

base of 2nd metacarpal

Front 15

Max ramp weight?

Back 15

34,700

Front 16

what are the attachments of the brachioradialis?

Back 16

superior part of lateral supracondylar ridge
lateral intermuscular septum

base of styloid process of radius

Front 17

what nerve is deep to the brachioradialis?

Back 17

superficial radial nerve

Front 18

what is deep to the brachioradialis in the forearm?

Back 18

superficial radial nerve
radial artery

Front 19

what innervates the brachioradialis?

Back 19

posterior interosseous nerve

(radial nerve - C5, C6)

Front 20

what muscle acts as a flexor, though it is innervated by an extensor nerve?

Back 20

brachioradialis

Front 21

what innervates the extensor carpi radialis longus?

Back 21

posterior interosseous nerve

(radial nerve - C5, C6)

Front 22

what are the attachments of the extensor carpi radialis brevis?

Back 22

common extensor tendon, adjacent capsule and septa

base of 3rd metacarpal

Front 23

what innervates the extensor carpi radialis brevis?

Back 23

posterior interosseous nerve

(radial nerve - C6, C7)

Front 24

what muscles are in the posterior group of the extensor compartment of the forearm?

Back 24

extensor digitorum communis
extensor digiti minimi (quinti)
extensor carpi ulnaris
anconeus

Front 25

what innervates the extensor digitorum communis?

Back 25

posterior interosseous nerve (C7, C8)

Front 26

what innervates the extensor digiti minimi?

Back 26

posterior interosseous nerve (C7, C8)

Front 27

what innervates the extensor carpi ulnaris?

Back 27

posterior interosseous nerve (C7, C8)

Front 28

what are the attachments of the extensor digitorum communis?

Back 28

common extensor tendon (lateral epicondyle)

extensor expansion of middle and distal phalanges of the 2nd, 3rd, 4th, and 5th fingers

Front 29

what are the attachments of the extensor digiti minimi?

Back 29

common extensor tendon (lateral epicondyle)

extensor expansion at base of proximal phalanx of digit V

Front 30

what are the attachments of the extensor carpi ulnaris?

Back 30

common extensor tendon (lateral epicondyle)

base of fifth metacarpal

Front 31

what are the actions of the extensor digitorum communis?

Back 31

extension of hand, wrist and fingers

Front 32

what are the actions of the extensor carpi ulnaris?

Back 32

extends wrist
adducts wrist

Front 33

what are the actions of the extensor digiti minimi?

Back 33

extends little finger at all joints

Front 34

what are the attachments of the anconeus?

Back 34

posterior aspect of lateral epicondyle

lateral surface of olecranon and adjacent ulna

Front 35

what innervates the anconeus?

Back 35

radial nerve (C7, C8, T1)

Front 36

what are the actions of the anconeus?

Back 36

weak extensor of the elbow

Front 37

what muscles are in the outcropping muscles of the thumb?

Back 37

abductor pollicis longus
extensor pollicis brevis
extensor pollicis longus

Front 38

what innervates the outcropping muscles to the thumb?

Back 38

posterior interosseous nerve (C6, C7, C8)

Front 39

what are the attachments of the abductor pollicis longus?

Back 39

radius
ulna

base of metacarpal of first digit

Front 40

what innervates the abductor pollicis longus?

Back 40

posterior interosseous nerve (C6, C7, C8)

Front 41

what are the attachments of the extensor pollicis brevis?

Back 41

radius

proximal phalanx of first digit

Front 42

what innervates the extensor pollicis brevis?

Back 42

posterior interosseous nerve (C6, C7, C8)

Front 43

what are the attachments of the extensor pollicis longus?

Back 43

ulna

distal phalanx of first digit

Front 44

what innervates the extensor pollicis longus?

Back 44

posterior interosseous nerve (C6, C7, C8)

Front 45

what are the attachments of the extensor indicis?

Back 45

ulna, just distal to extensor pollicis longus

dorsal expansion of second digit

Front 46

what innervates the extensor indicis?

Back 46

posterior interosseous nerve (C6, C7, C8)

Front 47

what are the attachments of the extensor retinaculum?

Back 47

radius

pisiform
triquetrum

Front 48

what are the six extensor tunnels (from lateral to medial)?

Back 48

1 abductor pollicis longus & extensor pollicis brevis
2 extensor carpi radialis brevis & longus
3 extensor pollicis longus
4 extensor digitorum communis & extensor indicis
5 extensor digiti minimi
6 extensor carpi ulnaris

Front 49

where do the tendons of the extensor indicis and of the extensor digiti minimi join the tendons of the extensor digitorum?

Back 49

near the knuckles

Front 50

what are the oblique bands of intertendinous connections that unify the four tendons of the extensor digitorum? what is their function?

Back 50

vinculae

result in lesser, independent actions of fingers

Front 51

what tendon pulls mainly on the median band of the dorsal expansion?

Back 51

extensor digitorum communis

Front 52

what pulls on the side bands of the dorsal expansion?

Back 52

interosseous tendon
lumbrical tendon

Front 53

what are the actions of the lumbricals?

Back 53

flex intermetacarpophalangeal joints
abduct intermetacarpophalangeal joint
adduct intermetacarpophalangeal joint
extend proximal and distal interphalangeal joints

Front 54

what are the actions of the interossei?

Back 54

flex intermetacarpophalangeal joints
abduct intermetacarpophalangeal joint
adduct intermetacarpophalangeal joint
extend proximal and distal interphalangeal joints

Front 55

what nerve innervates the interossei?

Back 55

deep ulnar nerve

Front 56

how many interossei are in each hand?

Back 56

4 dorsal
3 palmar

Front 57

which interossei abduct and which adduct?

Back 57

dorsal abduct (DAB)
palmar adduct (PAD)

Front 58

what are the attachments of the interossei?

Back 58

bases of proximal phalanges

extensor expansions

Front 59

which interossei are double headed?

Back 59

dorsal interossei have double heads from facing sides of bodies of 5 metacarpals

palmar interossei have single heads arising from anterior border of metacarpals 2, 4, and 5

Front 60

on which metacarpals are the palmar interossei attached?

Back 60

2, 4, 5

Front 61

what nerve provides cutaneous innervation of the nail beds on the dorsum of the hand?

Back 61

median nerve

Front 62

what nerve innervates the medial 1.5 digits?

Back 62

ulnar nerve
(by a dorsal cutaneous nerve)

Front 63

what nerve innervates the lateral 3.5 digits short of the nail beds?

Back 63

radial nerve

Front 64

where is the dorsal venous arch of the hand?

Back 64

subcutaneous

Front 65

what forms the dorsal venous arch of the hand?

Back 65

companion veins

Front 66

into what does the dorsal venous arch of the hand empty?

Back 66

cephalic and basilic veins