Posterior Forearm Muscles

Front 1

posterior forearm description of common origin/outlaw

Back 1

8 muscles on the common flexor origin, all on the common extensor origin, lateral epicondlye and epicondylar ridge first 2 are outlaws, and the last is outlaw. 3 outlaw do not cross the wrist

Front 2

posterior forearm outlaws do/have/located

Back 2

do not cross the wrist
have dominate action at the elbow
one is located in the arm muscle group

Front 3

posterior forearm superficial layer has 5, and 2

Back 3

5 extensors in the superficial layer on the common extensor origin, 2 are extensor carpi radialis muscles.
5 extensors follow the rules!

Front 4

superficial layer continued/mutual neutralizer?

Back 4

one is lon and one is short, longus and brevis. extensor carpi radialis muscles are mutual neutralizers with flexor carpi radialis for radial deviation

Front 5

posterior forearm superficial only one of 3 parts

Back 5

there is only 1 extensor digitorum- the communis
one specializes in the pinky
extensor digiti minimi
and one ulnaris to mimic the anterior forearm

Front 6

1st 7 posterior extensors are

Back 6

in the superficial layer

Front 7

brachioradialis description

Back 7

posterior forearm, lateral location
stabilizes rotary action at radius as it flexes at the elbow

Front 8

brachioradialis must dominate in? with added? or increased?

Back 8

must dominate in flexion with added resistance or increased speed of contraction

Front 9

brachioradialis assists in

Back 9

pronation and supination with resistance

Front 10

brachioradialis found/palpated/trained

Back 10

easily palpated, on the prominent ridge on the lateral forearm. it is best trained in a neutral wrist position (halfway between pronation and supination) performing elbow flexion

Front 11

brachioradialis o/i/a

Back 11

O:lateral epicondylar ridge
i:styloid process of radius
a:elbow flexion, assists in pronation when in a supinated position and supination when in a pronated position at distal radius

Front 12

extensor carpi radialis longus description/mutual neutralizer

Back 12

wrist action, mutual neutralizer with flexor carpi radialis for radial deviation, longest of a pair that are closely related in origin, insertion, and action.

Front 13

extensor carpi radialis longus o/i/a/

Back 13

o:lateral epicondyle ridge
i:#2 metacarpal base
a:elbow/wrist extension, radial deviation

Front 14

extensor carpi radialis brevis description

Back 14

wrist action, mutual neutralizer with flexor carpi radialis for radial deviation. shortest of a pair that are closely related in origin, insertion, and action

Front 15

extensor carpi radialis brevis o/i/a

Back 15

o:lateral epicondlye ridge
i:#2,3 metacarpal base
a:elbow/wrist extension
radial deviation

Front 16

extensor digitorum communis description

Back 16

only 4 digit extensor

Front 17

extensor digitorum communis antagonistic to which 2 flexor digitorum msucles

Back 17

flexor digitorum superficialis and flexor digitorum profundus

Front 18

extensor digitorum communis o/i/a

Back 18

o:lateral epicondyle
i:base and lateral surface of the middle and distal phalanx 2,3,4,5
a:wrist/elbow/finger extension

Front 19

extensor digiti minimi o/i/a

Back 19

o:lateral epicondyle and extensor digitorum communis tendon
i:extensor digitorum communis tendon
a:elbow/wrist/and #5 digit extension

Front 20

extensor carpi ulnaris description

Back 20

wrist action
mutual eutralizer with flexor carpi ulnaris for ulnar deviation

Front 21

extensor carpi ulnaris o/i/a

Back 21

o: lateral epicodyle and upper post. ulna
i:base of #5 metacarpal
a:elbow/wrist extension and ulnar deviation

Front 22

deep posterior forearm msucles description

Back 22

5 muscles in deep layer, only one common extensor origin, outlaw muscle (supinator)
other 4 are specialty digit extensors

Front 23

supinator description

Back 23

outlaw muscle, does not cross the wrist, primary supinator, bicep is secondary, 1st of deep layer and only deep layer on the common origin

Front 24

supinator o/i/a

Back 24

o: lateral epicondlye and proximal border of ulna
i: lateral proximal radius
a:supination and assistor for extension

Front 25

extensor indicis proprius description

Back 25

1st to deviate from common extensor origin
1st digit specialty muscle of the deep layer
oriented toward the index indicis finger

Front 26

extensor indicis proprius o/i/a

Back 26

o:posterior distal ulna
i:base #2 distal phalanx
a:wrist/index finger extension

Front 27

posterior forearm pollicis muscle snuff box

Back 27

abductor pollicis, extensor pollicis brevis, extensor pollicis longus

Front 28

abductor, extensor brevis, longus o/i/a

Back 28

o:post.ulna/radius, post. radius, and post. ulna
i: #1 distal phalanx
a:abduction, extension of the thumb