Anatomy: Posterior Forearm And Hand

Front 1

What muscle tendons are the edges of the Anatomical snuff box?

Back 1

- abductor pollicis longus
- extensor pollicis brevis
- extensor pollicis longus

Front 2

What 2 muscles pass through the ulnar side of the anatomical snuff box?

Back 2

- extensor carpi radialis longus
- extensor carpi radialis brevis

Front 3

What artery passes through the anatomical snuff box?

Back 3

- radial artery

Front 4

What forms the floor of the anatomical snuff box?

Back 4

- scaphoid bone
- trapezium bone
- styloid process of the radius (lateral side of radius)

Front 5

How many muscles are in the superficial layer of the muscles?

Back 5

6

Front 6

Where do all of the superficial muscles of the forearm originate from? Innervated by?

Back 6

- lateral epicondyle/ supracondylar line
- radial nerve and branches

Front 7

Where is the origin of teh brachioradialis?

Back 7

- lateral supracondylar and some lateral epicondyle

Front 8

Where does the brachioradialis muscle insert?

Back 8

- styloid process of the radius (lateral side)

Front 9

What does the brachioradialis do?

Back 9

- flexes forearm and elbow

Front 10

What innervates the brachioradialis?

Back 10

- main trunk of radial nerve

Front 11

What nerve is just deep to the brachioradialis and what type of fibers does it have?

Back 11

- superficial branch of the radial nerve
- sensory fibers

Front 12

Where is the origin of the extensor carpi radialis longus?

Back 12

- lateral supracondylar ridge

Front 13

where does the extensor carpi radialis longus insert?

Back 13

- dorsal side of the base of the second metacarpal

Front 14

What innervates the extensor carpi radialis longus?

Back 14

- main trunk of radial nerve

Front 15

What does the extensor carpi radialis longus do?

Back 15

- long extender of the wrist

Front 16

What compartment under the extensor retinaculum does the extensor carpi radialis longus pass through?

Back 16

- second compartment

Front 17

What muscle is paired with the extensor carpi radilis longus?

Back 17

- extensor carpi radialis brevis

Front 18

Where does the extensor carpi radialis brevis originate?

Back 18

- lateral epicondyle

Front 19

Where does the extensor carpi radialis brevis insert?

Back 19

- base of third metacarpal

Front 20

What compartment under the extensor retinaculum does the extensor carpi radialis brevis pass through?

Back 20

- second compartment

Front 21

What innervates the extensor carpi radialis brevis?

Back 21

- deep branch radial nerve

Front 22

What type of fibers does the deep branch of the radial nerve contain?

Back 22

- all motor

Front 23

What does the extensor carpi radialis brevis do?

Back 23

- assists the extensor carpi radialis longus extend the wrist towards the radial side

Front 24

Where does the extensor digitorum muscle originate?

Back 24

- lateral epicondyle

Front 25

Where does the extensor digitorum muscle insert?

Back 25

- often splits into the four fingers (2,3,4,5th digits)
- each tendon splits into 3 with the central attaching to the base of the middle phalanx and the 2 lateral attaching to the base of the distal phalanx

Front 26

Which compartment does the extensor digitorum pass through under the extensor retinaculum?

Back 26

- 4th

Front 27

What innervates the extensor digitorum?

Back 27

- posterior interosseous nerve

Front 28

Where does the extensor digiti minimi originate?

Back 28

- lateral epicondyle

Front 29

Where does the extensor digiti minimi insert?

Back 29

- extensor hood of little finger/pinky

Front 30

Which compartment under the extensor retinaculum does the extensor digiti minimi pass through?

Back 30

- 5h

Front 31

What innervates the extensor digiti minimi?

Back 31

- posterior interosseous nerve

Front 32

What is odd about the tendon of the extensor digiti minimi?

Back 32

- before retinaculum= 1 tendon
- after retinaculum= 2 tendons

Front 33

What muscle tendons go (or may go) to the pinky?

Back 33

- extensor digiti minimi (does go)
- extensor digitorum (may go)

Front 34

Where does the extensor carpi ulnaris originate?

Back 34

- lateral epicondyle

Front 35

Where does the extensor carpi ulnaris insert?

Back 35

- base of 5th metacarpal

Front 36

Which compartment under the extensor retinaculum does the extensor carpi ulnaris pass through?

Back 36

- 6th

Front 37

What innervates the extensor carpi ulnaris?

Back 37

- posterior interosseous

Front 38

What does the extensor carpi ulnaris do?

Back 38

- extends the wrist towards the ulnar/addut direction

Front 39

Where does the anconeus muscle originate?

Back 39

- lateral epicondyle

Front 40

Where does the aconeous insert?

Back 40

- upper 1/4th of the ulna

Front 41

Where does the extensor pollicis brevis originate?

Back 41

- radius

Front 42

Where does the extensor pollicis brevis insert?

Back 42

- proximal phalanx of thumb

Front 43

What compartment under the extensor retinaculum does the extensor pollicis brevis pass through?

Back 43

- 1st

Front 44

What innervates the extensor pollicis brevis?

Back 44

- posterior interosseous

Front 45

What is paired with the extensor pollicis brevis?

Back 45

- extensor pollicis longus

Front 46

Where does teh extensor pollicis longus originate?

Back 46

- ulna

Front 47

where does the extensor pollicis longus insert?

Back 47

- base of distal phalanx of thumb

Front 48

Which compartment under the extensor retinaculum does the extensor pollicis longus pass through?

Back 48

- 3rd

Front 49

What happens after the extensor pollicis longus passes the dorsal radial tubercle (Lister's tubercle)?

Back 49

- changes direction

Front 50

What is the structure that causes the extensor pollicis longus to change direction?

Back 50

- dorsal radial tubercle (Lister's tubercle)

Front 51

Where does the extensor indicis orginate?

Back 51

- distal ulna, interosseous membrane

Front 52

What innervates the extensor pollicis longus?

Back 52

- osterior interosseous

Front 53

Where does the extensor indicis insert?

Back 53

- extensor hood of index finger

Front 54

Which compartment under the extensor retinaculum does the extensor indicis pass through?

Back 54

- 4th

Front 55

What innervates the extensor indicis?

Back 55

- posterior interosseous

Front 56

What does the extensor indicis do?

Back 56

- extends index

Front 57

How many compartments does the extensor retinaculum have?

Back 57

- 6

Front 58

What is in the 1st compartment of the extensor retinaculum?

Back 58

- abductor pollicis longus
- extensor pollicis brevis

Front 59

what is in the 2nd compartment of the extensor retinaculum?

Back 59

- extensor carpi radialis longus
- extensor carpi radialis brevis

Front 60

What is in the 3rd compartment of the extensor retinaculum?

Back 60

- extensor pollicis longus

Front 61

What is in the 4th compartment of the extensor retinaculum?

Back 61

- extensor digitorum tendons (3 or 4)
- extensor indicis tendon (1)

Front 62

What is in the 5th compartment of the extensor retinaculum?

Back 62

- extensor digiti minimi tendon

Front 63

What is in the 6th compartment of the extensor retinaculum?

Back 63

- extensor carpi ulnaris tendon

Front 64

Is the 1st compartment of the extensor retinaculum on the thumb or pinky side (lateral or medial)

Back 64

- thumb or lateral

Front 65

Is the 6th compartment of the extensor retinaculum on the thumb or pinky side (lateral or medial)

Back 65

- pinky or lateral

Front 66

Which is the largest compartment of the extensor retinaculum?

Back 66

- 4th

Front 67

Where does the posterior interosseous artery run in the posterior forearm?

Back 67

- deep to supinator

Front 68

What does the posterior interosseous artery run with?

Back 68

- posterior interosseous nerve

Front 69

Where does the posterior branch of the anterior interosseous artery? What stops at this point?

Back 69

- above the wrist
- posterior interosseous artery stops here

Front 70

What artery is the main supplier of the dorsal carpal arch?

Back 70

- radial artery

Front 71

What are the 3 'minor' contributors of the dorsal carpal arch?

Back 71

- ulnar artery
- anterior and posterior interosseous arteries

Front 72

What are dorsal metacarpal arteries?

Back 72

- branches of the dorsal carpal arch that carry blood to fingers

Front 73

Where are the dorsal digital arteries?

Back 73

- one on each side of each finger

Front 74

What 2 arteries branch off the radial artery before it goes down for deep palmer arch?

Back 74

- dorsalis pollicis
- dorsalis indicis

Front 75

What does the radial nerve supply?

Back 75

- all muscles of posterior forearm

Front 76

What does the main trunk of the radial nerve supply?

Back 76

- extensor carpi radialis longus
- brachioradialis
- aconeos

Front 77

What does the superficial radial nerve supply?

Back 77

- cutaneous posterior forearm and hand

Front 78

What do the deep radial nerve supply?

Back 78

- extensor carpi radialis brevis
- supinator

Front 79

What does the posterior interosseous nerve supply?

Back 79

- extensor digitorum
- extensor digiti minimi
- extensor carpi ulnaris
- abductor pollicis longus
- extensor pollicis brevis
- extensor pollicis longus
- extensor indicis

Front 80

What does the dorsal branch of the ulnar nerve supply?

Back 80

- medial aspect of dorsal digits