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Flashcards in Muscles of the Posterior Forearm Deck (59):
1

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

Muscles of the posterior forearm

2

All muscles of the posterior forearm are innervated by the

Radial Nerve

3

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

Common extensor tendon from the lateral epicondyle of the humerus

4

The other 2 muscles of the posterior forearm originate where?

Slightly above the others on the lateral supracondylar ridge

5

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

Extensor Retinaculum

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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

Extensor expansion hood

7

The 7 muscles of the superficial posterior forearm

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

8

Long thin muscle partly overlapped by the brachioradialis on posterior forearm

Extensor Carpi Radialis Longus

9

Where does the extensor carpi radialis insert?

Base of 2nd metacarpal

10

Actions of the extensor carpi radialis

Extends and abducts the wrist (makes a fist)

11

Origin of the extensor radialis longus

Lateral supracondyle ridge of the humerus

12

Innervated by

Radial nerve

13

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

Extensor radialis brevis

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Actions of the extensor radialis brevis

Extends and abducts the wrist

15

Origin of the extensor carpi radialis brevis

Lateral epicondyle of the humerus (common extensor tendon

16

Insertion of the extensor carpi radialis brevis

Base of the 3rd metacarpal

17

Innervated by

Radial Nerve

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The muscle that is the main extensor of the four fingers

Extensor Digitorum

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

The extensor expansion hood

20

Actions of the extensor digitorum

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

21

Origin of the extensor digitorum

Insertion of the extensor digitorum

Nerve

Lateral epicondyle of the humerus

Extensor expansion hood

Radial nerve

22

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

Extensor Digiti Minimi

23

Actions of extensor digiti minimi

Extends proximal phalynx of fifth finger
Assists in extension of hand

24

Innervated by

Radial Nerve

25

Long band like muscle located along medial border of the forearm

Extensor Carpi Ulnaris

26

The actions of the extensor carpi ulnaris

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

27

Origins of the extensor carpi ulnaris

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

28

The five deep muscles of the posterior forearm

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

29

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

Supinator

30

The origins of the supinator

Lateral epicondyle of the humerus
The ulna

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Insertion of the supinator

The upper 1/3 of the radius

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action of the supinator with the biceps brachii

Rotates the radius during supination

33

Muscle that is recruited when rapid forceful supination occurs

Biceps Brachii

34

A triangular depression on the dorso lateral side of the hand

Anatomical Snuffbox

35

Name the boundaries of the anatomical snuffbox

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

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

Abductor pollicis longus

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

Abductor pollicis longus

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Action of the abductor pollicis longus

Abducts and extends the thub

39

Origination of abductor pollicis

Posterior radius and ulna,
Interosseous membrane

40

Insertion of abductor pollicis

Base of the first metacarpal

41

Innervation

Radial Nerve

42

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

Extensor pollicis longus and brevis

43

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

Extensor pollicis brevis

44

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

Extensor pollicis longus

45

Actions of both the extensor pollices muscles

Extend the thumb
Abduct the hand

46

Origin of brevis

Dorsal Radius

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Origin of longus

Ulna

48

Insertion of brevis

Proximal Phalynx of thumb

49

Insertion of longus

Distal phalynx of thumb

50

Movement of the thumb that bends the thumb medially

Flexion

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Movement of the thumb that points the thumb laterally

Extension

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Movement of the thumb that points anteriorly

Abduction

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Movement of the thumb that brings it back posteriorly

Adduction

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

Extensor indicis

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Origin of the extensor indicis

Posterior surface of the ulna
Interosseous membrane

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Innervation of extensor indicis

Radial nerve

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Action of extensor indicis

Extends the index finger

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

Lateral epicondylitis (Tennis Elbow)

59

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

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