Anatomy Extensor Forearm & Dorsal Hand

Front 1

Osteology & Fascia
Post wrist the antebrachial fascia is thickended to form the

Back 1

extensor retinaculum

Front 2

extensor retinaculum is attached to the ____laterally & the______ medially

Back 2

radius
ulna, triquetrum & pisform

Front 3

The purpose of extensor retinaculum; a fibrous band that hold the in _____position, prevents _____during extension

Back 3

extensor muscle tendons bowstringing

Front 4

The long extensor tendon is ___ to the metacaropophalangeal jts

Back 4

distal

Front 5

The long extensor tendon for digits 2-5 expands into an aponeruosis that covers the

Back 5

dorsal surface of the proximal phalanx

Front 6

Extensor expansions continue distally to the

Back 6

middle & distal phalanges

Front 7

Muscles of the Extensor forearm
Six muscles of the superficial grp

Back 7

Brachoradialis
Ext Carpi radialis longus
Ext Carpi radialis brevis
Ext digitorum
Ext digiti minimi
Ext carpi ulnaris

Front 8

Muscles of the Extensor forearm
Deep grp

Back 8

supinator
abd pollicis longus
Ext pollicis brevis
Ext pollicis longus
Exnt indicis

Front 9

Present on the post aspect of the FA these muscles are primarily extensors of the

Back 9

wrist jt & digits

Front 10

The muscles of the deep & superficial grp are all innervated by the ___ nerve

Back 10

radial nerve (C5-T1)

Front 11

Two muscles of the superficial grp arise from the supracondylar ridge of the humerus

Back 11

brachioradials
Ext carpi radialis longus

Front 12

Most lateral of the muscles, inserts on the distal end of the radius.

Back 12

Brachioradialis

Front 13

Brachioradialis is grp'd with the extensors but is actually a

Back 13

flexor muscle

Front 14

inserts on the base of the 3rd metacarpal, extends, abducts the hand

Back 14

ext carpi radialis longus

Front 15

The other 4 superficial have an origin through a common tendon from the lateral epicondyle of the humerus

Back 15

lateral to medial
Ext Carpi radialis brevis
Ext digitorum
Ext digiti minimi
Ext carpi ulnaris

Front 16

inserts on the base of the 3rd metacarpal, ext, abducts the hand

Back 16

Ext Carpi radialis brevis

Front 17

tendons of this muscle insert into the expansions of the medial four digits, ext digits at the metacarpophalangeal & interpalangeal jts, also assits in ext of hand

Back 17

ext digitorum

Front 18

inserts into the ext expansion of the 5th digit & extends this digit

Back 18

ext digiti minimi

Front 19

inserts on the base of the 5th metacarpal, ext & adducts the hand

Back 19

ext carpi ulnaris

Front 20

All deep muscles take origin from the

Back 20

ulna, radius or both

Front 21

originates from the lat epicondyle of the humerus & the ulna, wraps around radius, inserts on this bone & supinates the FA

Back 21

Supinator

Front 22

arise from the radius, ulna & interosseous membrane inserts on the base of the 1st metacarpal, abducts thumb helps to extend it

Back 22

abductor pollicis longus

Front 23

arise from the radius and interosseous memb, inserts on the prox phalanx of the thumb

Back 23

abductor pollicus brevis

Front 24

arise from the ulna & interosseous memb, inserts on the distal phalanx of the thumb

Back 24

ext pollicus longus

Front 25

arise from the ulna & interosseus memb, inserts ext expansion of the 2nd digit, extends digit, helps ext hand

Back 25

extensor indicis

Front 26

Three muscles acting on the thumb have their origins deep to the superficial exts, appear to crop out into view, they are reffered to as the

Back 26

outcropping muscles

Front 27

triangular interval bounded ant by tendons of abductor pollicis longus & ext pollicis brevis, tendons of abd pollicis longus

Back 27

anatomical snuff box

Front 28

Boundaries of the anatomical snuff box can be observed w/ abduction & ext of the

Back 28

thumb

Front 29

the ___artery crosses the floor of the snuff box formed by the scaphoid & trapezium to enter the palm

Back 29

radial artery

Front 30

Nerves of ext FA & Dorsal hand
3 nerves supply cutaneous innervation to the extensor FA

Back 30

lateral antebrachial cutaneous nerve (cont from musculocut nerve), medial antebrachial cut, post antebrachial cut nerve

Front 31

lateral antebrachial cut nerve

Back 31

skin on the radial side of the FA

Front 32

medial antebrachial cut nerve (branch of the medial cord of the brachial plexus) supplies the

Back 32

skin of the ulnar side

Front 33

post antebrachial cut nerve (branch of the radial nerve) supplies

Back 33

an area on the posterior FA bet the distributions of 2 other nerves

Front 34

Motor nerve of the ext FA is the ___nerve

Back 34

radial nerve

Front 35

After the radial nerve innervates the ext carpi radialis longus & brachioradialis it divides into

Back 35

superfical & deep brachches

Front 36

The smaller superficial nerves (cont of the main nerve, is all a ___nerve

Back 36

sensory

Front 37

Superificial branch of the radial nerve comes from under the brachioradialis, emerges into the fascia near the wrist to supply the

Back 37

skin on the dorsal wrist, lat 1/2 of the dorsum of the hand, & prox half of lateral 2,5 digits (thumb, index fing, & lat 1/2 of middle )

Front 38

After branching of the radial nerve to ext carpi radialis brevis & supinator the deep branch of the radial pierces the supinator to enter the

Back 38

extensor comp of the FA

Front 39

nerve accompanies the post interosseous branch of the ulnar art, supplies the remainig exts & abd pollicis longus. No cutaneous innv. assoc with this nerve

Back 39

post interosseus nerve

Front 40

___&____nerves have no motor fxn in ext FA but have important cutaneous distrib in the dorsal hand

Back 40

median & ulnar nerves

Front 41

The ____sends sensory fibers to the dorsum of the distal 1/2 of the lateral 3.5 digits

Back 41

median nerve

Front 42

The ____nerve gives sensory fibers to the medial half of the dorsum of the hand & medial 1.5 digits (little finger & medial half of the ring finger

Back 42

ulnar nerve

Front 43

Arteries Of Ext FA & Dorsal hand
The more anterior portion of the ext FA is supplied by branches of the radial artery (lies under brachioradialis

Back 43

radial artery

Front 44

The largest branch to the extensor muscles is the

Back 44

recurrent artery

Front 45

a branch of the ulnar artery passes posteriorly between the radius & ulna, runs down on the interosseus memb to supply adj extensor muscle

Back 45

post interosseous artery

Front 46

As the post interosseus art reaches the wrist it joins the dorsal carpal branches of the raidal & ulnar branches to form

Back 46

anastomosing arches on the dorsum of the hand, give rise to small dorsal metacarpal & digital arteries

Front 47

Tendonitis of the elbow (tennis elbow) charact. by pain over the

Back 47

lateral epicondyl of the humerus

Front 48

Tendonitis of elbow follows prolonged & forceful ____ of the FA

Back 48

pronation-supination

Front 49

Tendonditis of the elbow SS are d/t inflammation of the

Back 49

common extensor tendon

Front 50

lesions of the radial nerve in the arm or cubital fossa may paralyze all the extensor muscles of the FA producing

Back 50

wrist drop

Front 51

Lumbricals are innervated by the ___ & ____ nerves & interossi are supplied by the ulnar, can still flex metacarpophalangeal jts, ext interphalangeal jts, wrist drops d/t lack of exts in FA

Back 51

median & ulnar nerves

Front 52

FX of the scaphoid results in the localized tenderness in the ____

Back 52

anatomical snuff box