Muscles Of The Posterior Forearm

Front 1

How many groups are in the forearm extensors? What are they, and which muscles are in these groups?

Back 1

3 groups:

1. Lateral [common origin is the supracondylar ridge of humerus except brevis]
-Brachioradialis *not a wrist flexor
-Extensor carpi radialis longus
-Extensor carpi radialis brevis

2. Posterior [share a common origin, lateral epicondyle]
-Extensor digitorum
-Extensor digiti minimi
-Extensor carpi ulnaris
-Anconeus*

3. Deep [share a common origin, interosseous membrane, except supinator]
-Abductor pollicis longus
-Extensor pollicis brevis
-Extensor pollicis longus
-Extensor indicis
-Supinator*

Front 2

Brachioradialis origin?

Back 2

Lateral supracondylar ridge

Front 3

Brachioradialis insertion?

Back 3

Base of the styloid process of the radius

Front 4

Brachioradialis function?

Back 4

Flexion of elbow

Front 5

Brachioradialis innervation?

Back 5

Radial nerve

Front 6

Extensor carpi radialis longus origin?

Back 6

Lateral supracondylar ridge

Front 7

Extensor carpi radialis longus insertion?

Back 7

Posterior part of the base of the 2nd metacarpal

Front 8

Extensor carpi radialis longus function?

Back 8

-Radial deviation
-Extends wrist

Front 9

Extensor carpi radialis longus innervation?

Back 9

Radial nerve

Front 10

Exensor carpi radialis brevis origin?

Back 10

-Lateral epicondyle
-Lateral collateral ligament

Front 11

Exensor carpi radialis brevis insertion?

Back 11

Posterior part of the base of 3rd metacarpal

Front 12

Exensor carpi radialis brevis function?

Back 12

-Extends wrist
-Radial deviation

Front 13

Exensor carpi radialis brevis innervation?

Back 13

Radial nerve

Front 14

Extensor digitorum origin?

Back 14

Lateral epicondyle

Front 15

Extensor digitorum insertion?

Back 15

Base of the 4 fingers by extensor expansion

Front 16

Extensor digitorum function?

Back 16

-Extends wrist
-Extends metacarpophalangeal joint
-Extends interphalangeal joint

Front 17

Extensor digitorum innervation?

Back 17

Radial nerve

Front 18

Extensor digiti minimi origin?

Back 18

Lateral epicondyle

Front 19

Extensor digiti minimi insertion?

Back 19

Extensor expansion of the baby finger

Front 20

Extensor digiti minimi function?

Back 20

Extends baby finger

Front 21

Extensor digiti minimi innervation?

Back 21

Radial nerve

Front 22

Extensor carpi ulnaris origin?

Back 22

Lateral epicondyle

Front 23

Extensor carpi ulnaris insertion?

Back 23

Posterior surface of base of 5th metacarpal

Front 24

Extensor carpi ulnaris function?

Back 24

-Ulnar deviation
-Wrist extensor

Front 25

Extensor carpi ulnaris innervation?

Back 25

Radial nerve

Front 26

Anconeus origin?

Back 26

Lateral epicondyle

Front 27

Anconeus insertion?

Back 27

Lateral surface of the olecranon process

Front 28

Anconeus function?

Back 28

Aids in elbow extension

Front 29

Abductor pollicis longus origin?

Back 29

Interosseous membrane

Front 30

Abductor pollicis longus insertion?

Back 30

Base of 1st metacarpal

Front 31

Abductor pollicis longus function?

Back 31

-Extends thumb
-Abducts thumb
-Radial deviation

Front 32

Extensor pollicis brevis origin?

Back 32

Interosseous membrane

Front 33

Extensor pollicis brevis insertion?

Back 33

Proximal phalanx of thumb

Front 34

Extensor pollicis brevis function?

Back 34

-Extends thumb (metacarpophalangeal joint)
-Radial deviation

Front 35

Extensor pollicis longus origin?

Back 35

Interosseous membrane

Front 36

Extensor pollicis longus insertion?

Back 36

Distal phalanx of thumb

Front 37

Extensor pollicis longus function?

Back 37

-Extends the interphalangeal joint of thumb
-Extends the metacarpophalangeal joint of thumb

Front 38

Extensor indicis origin?

Back 38

Interosseous membrane

Front 39

Extensor indicis insertion?

Back 39

Extensor expansion of index finger

Front 40

Extensor indicis function?

Back 40

Extension of index finger

Front 41

Supinator origin?

Back 41

-Lateral epicondyle
-radial and annular ligament

Front 42

Supinator insertion?

Back 42

Lateral and posterior/anterior aspect of radius (wraps around radius)

Front 43

Supinator function?

Back 43

Supinates the forearm