Muscles of the Posterior Forearm

Question 1

Group of muscles that are the extensors and supinators of the wrist and hand

Answer 1

Muscles of the posterior forearm

Question 2

All muscles of the posterior forearm are innervated by the

Answer 2

Radial Nerve

Question 3

4 of the 7 superficial muscles of the posterior forearm originate where?

Answer 3

Common extensor tendon from the lateral epicondyle of the humerus

Question 4

The other 2 muscles of the posterior forearm originate where?

Answer 4

Slightly above the others on the lateral supracondylar ridge

Question 5

All extensor muscle tendons that pass to the hand are held in place by

Answer 5

Extensor Retinaculum

Question 6

Attaches the tendons to the phalanges on the posterior side of the fingers. A triangular hood like structure that covers the dorsal surface of each digit

Answer 6

Extensor expansion hood

Question 7

The 7 muscles of the superficial posterior forearm

Answer 7

Anconeus
Extensor Carpi Ulnaris
Extensor Digiti Minimi
Extensor Digitorum
Extensor Carpi Radialis Brevis
Extensor Carpi Radialis Longus
Brachioradialis

Question 8

Long thin muscle partly overlapped by the brachioradialis on posterior forearm

Answer 8

Extensor Carpi Radialis Longus

Question 9

Where does the extensor carpi radialis insert?

Answer 9

Base of 2nd metacarpal

Question 10

Actions of the extensor carpi radialis

Answer 10

Extends and abducts the wrist (makes a fist)

Question 11

Origin of the extensor radialis longus

Answer 11

Lateral supracondyle ridge of the humerus

Question 12

Innervated by

Answer 12

Radial nerve

Question 13

Muscle that is slightly shorter than the extensor carpi radialis longus that lies deep to it

Answer 13

Extensor radialis brevis

Question 14

Actions of the extensor radialis brevis

Answer 14

Extends and abducts the wrist

Question 15

Origin of the extensor carpi radialis brevis

Answer 15

Lateral epicondyle of the humerus (common extensor tendon

Question 16

Insertion of the extensor carpi radialis brevis

Answer 16

Base of the 3rd metacarpal

Question 17

Innervated by

Answer 17

Radial Nerve

Question 18

The muscle that is the main extensor of the four fingers

Answer 18

Extensor Digitorum

Question 19

The insertion of the extensor digitorum that is a tent of connective tissue

Answer 19

The extensor expansion hood

Question 20

Actions of the extensor digitorum

Answer 20

Extends the proximal phalynx of the digits
Middle and distal phalanges are extended
Extends hand at the wrist

Question 21

Origin of the extensor digitorum

Insertion of the extensor digitorum

Nerve

Answer 21

Lateral epicondyle of the humerus

Extensor expansion hood

Radial nerve

Question 22

Muscle that is a thin slip partially attached to extensor digitorum that goes to the little finger

Answer 22

Extensor Digiti Minimi

Question 23

Actions of extensor digiti minimi

Answer 23

Extends proximal phalynx of fifth finger

Assists in extension of hand

Question 24

Innervated by

Answer 24

Radial Nerve

Question 25

Long band like muscle located along medial border of the forearm

Answer 25

Extensor Carpi Ulnaris

Question 26

The actions of the extensor carpi ulnaris

Answer 26

Extends with carpi radialis and adducts the flexor carpi radialis -(forms fist)

Question 27

Origins of the extensor carpi ulnaris

Answer 27

Lateral epicondyle Common extensor tendon Fibers of posterior surface of the ulna

Question 28

The five deep muscles of the posterior forearm

Answer 28

``` Supinator Abductor Pollicis Longus Extensor Pollicis Brevis Extensor Pollicis Longus Extensor Indicis ```

Question 29

Deep muscle of the posterior forearm that wraps tightly around the upper 1/3 of the radius

Answer 29

Supinator

Question 30

The origins of the supinator

Answer 30

Lateral epicondyle of the humerus | The ulna

Question 31

Insertion of the supinator

Answer 31

The upper 1/3 of the radius

Question 32

action of the supinator with the biceps brachii

Answer 32

Rotates the radius during supination

Question 33

Muscle that is recruited when rapid forceful supination occurs

Answer 33

Biceps Brachii

Question 34

A triangular depression on the dorso lateral side of the hand

Answer 34

Anatomical Snuffbox

Question 35

Name the boundaries of the anatomical snuffbox

Answer 35

Tendons of the extensor pollicis longus Extensor pollicis longus Abductor pollicis longus

Question 36

Muscle of the posterior forearm that originates deep to the superficial extensors and is the most lateral tendon of the snuff box

Answer 36

Abductor pollicis longus

Question 37

Muscle that crosses the tendons of the extensor carpi radialis longus and brevis

Answer 37

Abductor pollicis longus

Question 38

Action of the abductor pollicis longus

Answer 38

Abducts and extends the thub

Question 39

Origination of abductor pollicis

Answer 39

Posterior radius and ulna, | Interosseous membrane

Question 40

Insertion of abductor pollicis

Answer 40

Base of the first metacarpal

Question 41

Innervation

Answer 41

Radial Nerve

Question 42

Two muscles that exit obliquely from under the superficial muscle and cross over the extensor carpi radialis muscles

Answer 42

Extensor pollicis longus and brevis

Question 43

Which of these two muscles is closely associated with the abductor pollicis longus?

Answer 43

Extensor pollicis brevis

Question 44

Which of these two muscles hooks around a tubercle on the dorsum of the radius as a pulley?

Answer 44

Extensor pollicis longus

Question 45

Actions of both the extensor pollices muscles

Answer 45

Extend the thumb | Abduct the hand

Question 46

Origin of brevis

Answer 46

Dorsal Radius

Question 47

Origin of longus

Answer 47

Ulna

Question 48

Insertion of brevis

Answer 48

Proximal Phalynx of thumb

Question 49

Insertion of longus

Answer 49

Distal phalynx of thumb

Question 50

Movement of the thumb that bends the thumb medially

Answer 50

Flexion

Question 51

Movement of the thumb that points the thumb laterally

Answer 51

Extension

Question 52

Movement of the thumb that points anteriorly

Answer 52

Abduction

Question 53

Movement of the thumb that brings it back posteriorly

Answer 53

Adduction

Question 54

The deeply placed muscle covered by the extensor digitorum and inserts into the index finger

Answer 54

Extensor indicis

Question 55

Origin of the extensor indicis

Answer 55

Posterior surface of the ulna | Interosseous membrane

Question 56

Innervation of extensor indicis

Answer 56

Radial nerve

Question 57

Action of extensor indicis

Answer 57

Extends the index finger

Question 58

Inflammation of the common extensor tendon of the lateral epicondyle of the humerus, small area of origin and many muscles create high load per unit area

Answer 58

Lateral epicondylitis (Tennis Elbow)

Question 59

Inflammation of the common flexor tendon on the medial epicondyle of the humerus

Answer 59

Medial epincondylitis (thrower's elbow, golfer's elbow, little league elbow)