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General Anatomy (2nd year) > muscles of the forearm > Flashcards

muscles of the forearm Flashcards

1
Q

Pronator Teres Humeral Head Origin

A

medial epicondyle, deep antebrachial fascia

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2
Q

Pronator Teres Ulnar Head Origin

A

medial side of coronoid process of ulna,

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3
Q

Pronator Teres Insertion

A

midpoint of the lateral border of the radius, lateral border of muscle forms medial border of cubital fossa

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4
Q

Pronator Teres Action

A

pronation of forearm in rapid/forceful movement, works synergistically with pronator quadratus, flexion of elbow

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5
Q

Pronator Teres Nerve

A

Median Nerve C6-7

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6
Q

Flexor Carpi Radialis Origin

A

medial epicondyle, deep antebrachial fascia

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7
Q

Flexor Carpi Radialis Insertion

A

Palmar side of the base of second metacarpal, slip to base of third metacarpal

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8
Q

Flexor Carpi Radialis Action

A

Flexion of the radiocarpal joint, abduction/radial deviation of the radiocarpal joint when acting with radial extensors, assists in pronation of forearm, flexion of the elbow

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9
Q

Flexor Carpi Radialis Nerve

A

Median Nerve C6-8

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10
Q

Palmaris Longus Origin

A

medial epicondyle, deep antebrachial fascia

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11
Q

Palmaris Longus Insertion

A

distal end of flexor retinaculum, palmar aponeurosis

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12
Q

Palmaris Longus Action

A

flexion of the radiocarpal joint, tenses palmar fascia, flexion of the elbow, anchor for skin & fascia

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13
Q

Palmaris Longus Nerve

A

Median Nerve C6-8, T1

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14
Q

Flexor Carpi Ulnaris Humeral Head Origin

A

medial epicondyle

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15
Q

Flexor Carpi Ulnaris Ulnar Head Origin

A

Medial margin of olecranon process, upper 2/3 of posterior border of ulna (medial side), forms tenon in the lower half of the forearm

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16
Q

Flexor Carpi Ulnaris Insertion

A

pisiform, extended to hamate by pisohamate ligament, extended to base of 5th metacarpal by pisometacarpal ligament

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17
Q

Flexor Carpi Ulnaris Action

A

flexion of radiocarpal joint, adduction (ulnar deviation) of the hand, flexion of the elbow

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18
Q

Flexor Carpi Ulnaris Nerve

A

Ulnar nerve (C7-8, T1)

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19
Q

Flexor Digitorum Superficialis Radial Head Origin

A

anterior oblique line

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20
Q

Flexor Digitorum Superficialis Humero-Ulnar Head Origin

A

medial epicondyle of humerus, anterior band of UCL, medial side of coronoid process, deep antebrachial fascia

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21
Q

Flexor Digitorum Superficialis Insertion

A

sides of the shaft of the middle phalanx, tendons pass between the split superficialis tendon to insert on the bases of the distal phalanges

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22
Q

Flexor Digitorum Superficialis Action

A

flexion of PIP joints of digits 2-5, flexion of MP joints, flexion of radiocarpal joint

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23
Q

Flexor Digitorum Superficialis Nerve

A

Median Nerve C7-8, T1)

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24
Q

Flexor Digitorum Profundus Origin

A

upper 3/4 of medial & anterior border of ulna, anterior surface of ulnar half of interosseous membrane, deep antebrachial fascia, upper 3/4 posterior border of ulna with FCU & ECU

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25
Q

Flexor Digitorum Profundus Insertion

A

palmar surfaces of bases of distal phalanges 2-5, thick mm that covers the anterior & meidal aspect of the ulna

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26
Q

Flexor Digitorum Profundus Action

A

flexion of DIP joint after flexion of PIP joint by FDS, flexion of the MCP & PIP joint, curling fingers & clenching fist, flexion of radiocarpal/wrist joint,

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27
Q

Flexor Digitorum Profundus Nerve

A

Anterior interosseous branch of median nerve C8, T1

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28
Q

Flexor Pollicis Longus Origin

A

anterior surface of radius, lateral 1/2 of anterior surface of interosseous membrane, medial border of coronoid process of ulna, may attach to medial epicondyle of humerus, tendon passes under flexor retinaculum, blends with FDP/FDS & PT

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29
Q

Flexor Pollicis Longus Insertion

A

palmar surface of base of distal phalanx of thumb

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30
Q

Flexor Pollicis Longus Action

A

flexion of IP joint of thumb, flexion of MCP joint of thumb, wrist flexion

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31
Q

Flexor Pollicis Longus Nerve

A

Anterior interosseous branch of median nerve C8, T1, travels on interosseous membrane between FPL & FDP

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32
Q

Pronator Quadratus Origin

A

oblique ridge on lower 1/4 of anterior medial surface of ulna, fibres pass laterally & slightly downward

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33
Q

Pronator Quadratus Insertion

A

distal 1/4 of anterior lateral border & anterior shaft of radius, deep fibres insert into triangular area just above ulnar notch

34
Q

Pronator Quadratus Action

A

pronation of forearm, reinforced by pronator teres during rapid or forceful pronation, assists interosseous membrane in holding bones together during upward compressions (coaptation of radius & ulna)

35
Q

Pronator Quadratus Nerve

A

Anterior Interosseous Branch of Mediam Nerve C8, T1

36
Q

Brachioradialis Origin

A

Upper 2/3 of lateral supracondylar ridge of the humerus

37
Q

Brachioradialis Insertion

A

flat tendon into lateral side of lower end of radius just above styloid process (mm belly ends at midpoint flat tendon continues)

38
Q

Brachioradialis Action

A

flexion of the elbow, assists with pronation/supination in resisted movements, active during quick movement or resisted flexion, helps resist displacement of radial head when lifting weights

39
Q

Brachioradialis Nerve

A

Radial Nerve C5-6

40
Q

Supinator Deep Fibres Origin

A

supinator crest of ulna, most superior aspect of the interosseous broder of the ulna

41
Q

Supinator Superficial Fibres Origin

A

lateral epicondyle of the humerus, radial collateral ligament of elbow joint, annular ligament of superior radio-ulnar joint

42
Q

Supinator Insertion

A

lateral surface of proximal third of radius (above oblique line)

43
Q

Supinator Action

A

supination of forearm, prime for slow unopposed supination

44
Q

Supinator Nerve

A

Radial Nerve C5-7

45
Q

Extensor Carpi Radialis Longus Origin

A

lateral epicondyle, lower 1/3 of suprcondylar ridge

46
Q

Extensor Carpi Radialis Longus Insertion

A

dorsal aspect of base of 2nd MC

47
Q

Extensor Carpi Radialis Longus Action

A

extension of the wrist joint, abduction of the wrist joint, radial deviation, assists in elbow flexion, ECRL is indispensable when clenching fist

48
Q

Extensor Carpi Radialis Longus Nerve

A

Radial Nerve C5-8

49
Q

Extensor Carpi Radialis Brevis Origin

A

lateral epicondyle, radial collateral ligament of elbow, deep antebrachial fascia

50
Q

Extensor Carpi Radialis Brevis Insertion

A

dorsal aspect of base of 3rd MC, may send slip to 2nd MC with ECRL

51
Q

Extensor Carpi Radialis Brevis Action

A

extension of the midcarpal joint, abduction/radial deviation of the midcarpal joint, helps stabilize wrist for powerful finger flexion

52
Q

Extensor Carpi Radialis Brevis Nerve

A

Radial Nerve C6-8

53
Q

Extensor Digitorum Communis Origin

A

lateral epicondyle, deep antebrachial fascia

54
Q

Extensor Digitorum Communis Insertion

A

dorsal aspect of the base of the middle phalanx (medial four fingers 2-5), dorsal aspect on the base of the distal phalanx

55
Q

Extensor Digitorum Communis Action

A

principle extensor of the MCP joints of digits 2.5, extension of IP joints of digits 2-5, assists in extension & abduction of wrist

56
Q

Extensor Digitorum Communis Nerve

A

Posterior Interosseous Branch of the Radial Nerve (C7,8)

57
Q

Extensor Digiti Minimi Origin

A

lateral epicondyle, deep antebrachial fascia, intermuscular septum

58
Q

Extensor Digiti Minimi Insertion

A

dorsal aspect on the base of the middle & distal phalanx of the 5th finger, 2 slips branch off & attach on the dorsal aspect of the base of the distal phalanx, runs thru separated compartments of extensor retinaculum

59
Q

Extensor Digiti Minimi Action

A

extension of 5th MCP joint, extension of IP joints of fifth finger

60
Q

Extensor Digiti Minimi Nerve

A

Interosseous Branch of the Radial Nerve C6-8

61
Q

Extensor Carpi Ulnaris Origin

A

lateral epicondyle, upper 2/3 of the posterior border of the ulna (posterior & lateral aspect)

62
Q

Extensor Carpi Ulnaris Insertion

A

dorsal ulnar aspect of the base of the 5th MC, tendon passes in a groove between ulnar head & ulnar styloid, tendon felt just under styloid when wrist is flexed and extended

63
Q

Extensor Carpi Ulnaris Action

A

extension of the midcarpal joint, adduction/ulnar deviation of the radiocarpal joint, needed for clenching fist with ECRL

64
Q

Extensor Carpi Ulnaris Nerve

A

Posterior Interosseous Branch of the Radial Nerve (C6-8)

65
Q

Abductor Pollicis Longus Origin

A

Middle 1/3 lateral aspect of the posterior surface of the ulna, middle 1/3 posterior interosseous membrane, middle 1/3 of the posterior medial surface of the radius (above EPL)

66
Q

Abductor Pollicis Longus Insertion

A

radial side of the base of the first metacarpal of the thumb, trapezium

67
Q

Abductor Pollicis Longus Action

A

abducts the carpo-metacarpal joint of the thumb, extension of the thumb at the CMC joint, flexes & radially deviates wrist

68
Q

Abductor Pollicis Longus Nerve

A

Posterior Interosseous Branch of the Radial Nerve C7-8

69
Q

Extensor Pollicis Brevis Origin

A

Posterior surface of the middle 1/3 of medial aspect radius (inferior origin ABPL), post. Interosseous membrane middle 1/3 (lateral to EPL), visible as an oblique elevation in the lower forearm

70
Q

Extensor Pollicis Brevis Insertion

A

dorsal aspect of the base of the proximal phalanx of the thumb

71
Q

Extensor Pollicis Brevis Action

A

extension of the MCP joint of the thumb, extension of CMC joint, abducts CMC joint, assists with radial deviation

72
Q

Extensor Pollicis Brevis Nerve

A

Posterior Interosseous Branch of the Radial Nerve C7-8

73
Q

Extensor Pollicis Longus Origin

A

Middle 1/3 of posterior lateral surface of the shaft of the ulna, posterior middle 1/3 of the interosseous membrane, travels around medial side of dorsal tubercle of the radius, travels through the 3r compartment

74
Q

Extensor Pollicis Longus Insertion

A

base of the dorsal surface of the distal phalanx of the thumb (forms snuff box)

75
Q

Extensor Pollicis Longus Action

A

extension of the IP joint of the thumb, extension of the MCP & CMC joint of the thumb, assists in wrist abduction & extension

76
Q

Extensor Pollicis Longus Nerve

A

Posterior interosseous branch of the radial nerve C7-8

77
Q

Extensor Indicis Origin

A

posterior lateral surface of the ulna of the middle 1/3 (below EPL), middle 1/3 of the posterior interosseous membrane

78
Q

Extensor Indicis Insertion

A

base of the middle phalanx (dorsal), base of the distal phalanx (dorsal), tendon of EDC, passes under extensor retinaculum in 4th compartment with ED

79
Q

Extensor Indicis Action

A

extension of the DIP & PIP joint of the index finger (w/lumbricals & interossei), extension of the MCP joint of the index finger, extension of the wrist joint

80
Q

Extensor Indicis Nerve

A

Posterior Interosseous Branch of the Radial Nerve C7-8

General Anatomy (2nd year) (8 decks)

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