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KN 251 > Muscles of the Posterior Forearm > Flashcards

Muscles of the Posterior Forearm Flashcards

1
Q

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

A

Muscles of the posterior forearm

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2
Q

All muscles of the posterior forearm are innervated by the

A

Radial Nerve

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3
Q

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

A

Common extensor tendon from the lateral epicondyle of the humerus

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4
Q

The other 2 muscles of the posterior forearm originate where?

A

Slightly above the others on the lateral supracondylar ridge

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5
Q

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

A

Extensor Retinaculum

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6
Q

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

A

Extensor expansion hood

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7
Q

The 7 muscles of the superficial posterior forearm

A 
Anconeus
Extensor Carpi Ulnaris
Extensor Digiti Minimi
Extensor Digitorum
Extensor Carpi Radialis Brevis
Extensor Carpi Radialis Longus
Brachioradialis
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8
Q

Long thin muscle partly overlapped by the brachioradialis on posterior forearm

A

Extensor Carpi Radialis Longus

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9
Q

Where does the extensor carpi radialis insert?

A

Base of 2nd metacarpal

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10
Q

Actions of the extensor carpi radialis

A

Extends and abducts the wrist (makes a fist)

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11
Q

Origin of the extensor radialis longus

A

Lateral supracondyle ridge of the humerus

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12
Q

Innervated by

A

Radial nerve

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13
Q

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

A

Extensor radialis brevis

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14
Q

Actions of the extensor radialis brevis

A

Extends and abducts the wrist

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15
Q

Origin of the extensor carpi radialis brevis

A

Lateral epicondyle of the humerus (common extensor tendon

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16
Q

Insertion of the extensor carpi radialis brevis

A

Base of the 3rd metacarpal

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17
Q

Innervated by

A

Radial Nerve

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18
Q

The muscle that is the main extensor of the four fingers

A

Extensor Digitorum

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19
Q

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

A

The extensor expansion hood

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20
Q

Actions of the extensor digitorum

A

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

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21
Q

Origin of the extensor digitorum

Insertion of the extensor digitorum

Nerve

A

Lateral epicondyle of the humerus

Extensor expansion hood

Radial nerve

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22
Q

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

A

Extensor Digiti Minimi

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23
Q

Actions of extensor digiti minimi

A

Extends proximal phalynx of fifth finger

Assists in extension of hand

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24
Q

Innervated by

A

Radial Nerve

25
Q

Long band like muscle located along medial border of the forearm

A

Extensor Carpi Ulnaris

26
Q

The actions of the extensor carpi ulnaris

A

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

27
Q

Origins of the extensor carpi ulnaris

A

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

28
Q

The five deep muscles of the posterior forearm

A 
Supinator
Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Longus
Extensor Indicis
29
Q

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

A

Supinator

30
Q

The origins of the supinator

A

Lateral epicondyle of the humerus

The ulna

31
Q

Insertion of the supinator

A

The upper 1/3 of the radius

32
Q

action of the supinator with the biceps brachii

A

Rotates the radius during supination

33
Q

Muscle that is recruited when rapid forceful supination occurs

A

Biceps Brachii

34
Q

A triangular depression on the dorso lateral side of the hand

A

Anatomical Snuffbox

35
Q

Name the boundaries of the anatomical snuffbox

A

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

36
Q

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

A

Abductor pollicis longus

37
Q

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

A

Abductor pollicis longus

38
Q

Action of the abductor pollicis longus

A

Abducts and extends the thub

39
Q

Origination of abductor pollicis

A

Posterior radius and ulna,

Interosseous membrane

40
Q

Insertion of abductor pollicis

A

Base of the first metacarpal

41
Q

Innervation

A

Radial Nerve

42
Q

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

A

Extensor pollicis longus and brevis

43
Q

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

A

Extensor pollicis brevis

44
Q

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

A

Extensor pollicis longus

45
Q

Actions of both the extensor pollices muscles

A

Extend the thumb

Abduct the hand

46
Q

Origin of brevis

A

Dorsal Radius

47
Q

Origin of longus

A

Ulna

48
Q

Insertion of brevis

A

Proximal Phalynx of thumb

49
Q

Insertion of longus

A

Distal phalynx of thumb

50
Q

Movement of the thumb that bends the thumb medially

A

Flexion

51
Q

Movement of the thumb that points the thumb laterally

A

Extension

52
Q

Movement of the thumb that points anteriorly

A

Abduction

53
Q

Movement of the thumb that brings it back posteriorly

A

Adduction

54
Q

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

A

Extensor indicis

55
Q

Origin of the extensor indicis

A

Posterior surface of the ulna

Interosseous membrane

56
Q

Innervation of extensor indicis

A

Radial nerve

57
Q

Action of extensor indicis

A

Extends the index finger

58
Q

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

A

Lateral epicondylitis (Tennis Elbow)

59
Q

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

A

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

KN 251 (17 decks)

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