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Anatomy Of The Upper Extremity > Muscles of the forearm > Flashcards

Muscles of the forearm Flashcards

Learn the actions, attachments, and innervation

1
Q

Brachialis attachments

A

Distal half of anterior surface of humerus

Ulnar tuberosity and anterior coronoid process

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2
Q

Brachialis action

A

Elbow (humeroulnar) flexion

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3
Q

Brachialis innervation

A

Musculocutaneous C5-7

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4
Q

Flexor carpi ulnaris attachments

A

Common flexor tendon from medial epicondyle of humerus and posterior 2/3 of proximal ulna
Inserts at pisiform, hook of hamate, and base of the fifth met

Note that the ulnar nerve travels along this line

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5
Q

Flexor carpi ulnaris actions

A

Wrist flexion
Wrist ulnar deviation (adduction)
Assists humeroulnar flexion

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6
Q

Flexor carpi ulnaris innervation

A

Ulnar nerve C7/8, T1

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7
Q

Attachments of palmaris longus

A

Common flexor tendon from medial humeral epicondyle
Inserts at palmar aponeurosis and flexor retinaculum
Note, good landmark for median nerve

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8
Q

Actions of palmaris longus

A

Primary: gripping w palm
Secondary: wrist flexion humeroulnar flexion

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9
Q

Innervation of palmaris longus

A

Median nerve C5-T1

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10
Q

Attachments of flexor carpi radialis

A

Common flexor tendon at medial epicondyle
Base of 2nd and 3rd Mets
Note that radial nerve follows

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11
Q

Actions of FCR

A

Radial deviation (abduction)
wrist flexion
elbow flexion
assists pronation

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12
Q

Innervation of FCR

A

Median nerve C5-T1

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13
Q

Attachments of pronator teres

A

medial epicondyle of humerus and medial aspect of coronoid process
Middle 1/3 of lateral surface of radius

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14
Q

Actions of pronator teres

A

Pronation

Weak elbow flexion

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15
Q

Innervation of pronator teres

A

Median nerve C5-T1

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16
Q

Attachments of the flexor digitorum superficialis

A

Common flexor tendon, medial aspect of coronoid process, ulnar collateral ligament
Oblique line of radius
Insertions: middle phalanges of digits 2-5, note that there is a bifurcation near insertion for FDP to pass through

Note that median nerve passes between two heads

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17
Q

Actions of FDS

A

PIP, MIP and wrist flexion

Secondary: elbow flexion

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18
Q

Innervation of flexor digitorum superficialis

A

Median nerve C5-T1

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19
Q

Attachments of flexor digitorum profundus

A

Proximal 3/4s of medial anterior ulna, middle of anterior aspect of interosseus membrane
Insertion: palmar aspect of DIPs of digits 2-5, passing through bifurcation of FDS

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20
Q

Actions of FDP

A

Flexion at DIPs, MIPs, and PIPs of 2-5 and wrist flexion

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21
Q

Innervation of FDP

A

Digits 4/5 ulnar nerve C7-T1

Digits 2/3 median nerve C5-T1

22
Q

Attachments of Flexor pollicis longus

A

Anterior aspect of radius distal to oblique line down to pronator quadratus
Interosseus membrane on radial half
(note that FPL has its own tendinous sheath separate from flexor digitori)
Inserts at base of distal phalanx of pollux

23
Q

Actions of flexor pollicis longus

A

Flexion of pollux at IP and MCP

Wrist flexion

24
Q

Innervation of flexor pollicis longus

A

Median nerve C5-T1

25
Q

Attachments of pronator quadratus

A

Distal anterior medial 1/4 of ulna to distal anterior lateral radius (wraps borders of anterior forearm)

26
Q

Actions of pronator quadratus

A

Pronation (slow strong)

Holds radius and ulna together

27
Q

Innervation of pronator quadratus

A

Median nerve C5-T1

28
Q

Attachments of brachioradialis

A

Lateral supracondylar ridge of humerus to styloid of radius

29
Q

Actions of brachioradialis

A 
Elbow flexion (most effective in mid pronation (handshake position))
Assists pronation and  suppination
30
Q

Innervation of brachioradialis

A

Radial nerve C5-T1

31
Q

Attachments of extensor carpi radialis longus and brevis

A

Lateral supracondylar ridge of humerus
Insertions:
Dorsum of base of the 2nd met (longus)
Dorsum of base of 3rd met (brevis)

32
Q

Actions of extensor carpi radialis longus and brevis

A

Wrist extension, abduction

Assists elbow flexion

33
Q

Innervation of extensor carpi radialis longus and brevis

A

Radial nerve C5-T1

34
Q

Attachments of Extensor digitorum

A

Common extensor tendon from lateral epicondyle

Middle and distal phalanges of digits 2-5 w bifurcation at PIP for lumbricals

35
Q

Actions of extensor digitorum

A

Extension at DIPS/PIPS/MTPs of 2-5
Wrist extension
Assists elbow extension

36
Q

Innervation of extensor digitorum

A

Radial nerve C5-T1

37
Q

Extensor digiti minimi (part of ED but different sheath) attachments

A

Lateral epicondyle of humerus

Dorsal aspect of middle and distal fifth digit

38
Q

Extensor digiti minimi action

A

Extension of fifth digit

Assists wrist and elbow flexion

39
Q

Innervation of extensor digiti minimi

A

Radial nerve C5-T1

40
Q

Attachments of extensor carpi ulnaris

A

Common extensor tendon at lateral epicondyle

Dorsum of base of fifth

41
Q

Actions of extensor carpi ulnaris

A

Wrist extension
Ulnar deviation (adduction)
assists elbow extension

42
Q

Innervation of extensor carpi ulnaris

A

Radial nerve C5-T1

43
Q

Attachments of anconeus

A

Lateral epicondyle of humerus

lateral olecranon process and lateral proximal shaft of ulna (crosses over head of radius)

44
Q

Actions of anconeus

A

Elbow extension

Stabilizes head of radius

45
Q

Innervation of anconeus

A

Radial nerve C5-T1

46
Q

Attachments of supinator

A

Lateral epicondyle, supinator crest, radial collateral lig, annular lig
Envelops the neck and proximal
shaft of the radius
Lateral proximal radial shaft

47
Q

Actions of supinator

A

Supination

48
Q

Innervation of supinator

A

Deep branch radial nerve C5-T1

49
Q

Components of the anatomical snuffbox

A

Radial artery
Scaphoid
Trapezium

50
Q

Cubital fossa

A

Depression between pronator teres and brachioradialis

Also bordered by radial nerve, ulnar nerve and radial artery

51
Q

Borders of the anatomical snuffbox

A

Tendon of extensor pollicis longus
Abductor pollicis longus
Styloid process of the radius

Anatomy Of The Upper Extremity (4 decks)

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