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Anatomy > O & I: Forearm Extensors > Flashcards

O & I: Forearm Extensors Flashcards

1
Q

Origin: Brachioradialis

A

Proximal two thirds of supra-epicondylar ridge of humerus

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2
Q

Insertion: Brachioradialis

A

lateral surface of distal end of radius proximal to styloid process

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3
Q

Innervation: Brachioradialis

A

Radial Nerve (C5, C6, C7)

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4
Q

Action: Brachioradialis

A

Relatively weak flexion of forearm; maximal when forearm is in neutral position

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5
Q

Origin: Extensor Carpi Radialis Longus (ECRL)

A

Lateral supra-epicondylar ridge of humerus

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6
Q

Insertion: Extensor Carpi Radialis Longus (ECRL)

A

Dorsal aspect of base of 2nd metacarpal

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7
Q

Innervation: Extensor Carpi Radialis Longus (ECRL)

A

Radial Nerve (C6, C7)

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8
Q

Action: Extensor Carpi Radialis Longus (ECRL)

A

Extend and abduct hand at the wrist joint; active during fist clenching

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9
Q

Origin: Extensor Carpi Radialis Brevis (ECRB)

A

Lateral epicondyle of humerus

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10
Q

Insertion: Extensor Carpi Radialis Brevis (ECRB)

A

Dorsal aspect of base of 3rd metacarpal

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11
Q

Innervation: Extensor Carpi Radialis Brevis (ECRB)

A

Deep Branch of radial nerve (C7, C8)

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12
Q

Action: Extensor Carpi Radialis Brevis (ECRB)

A

Extend and abduct hand at the wrist joint

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13
Q

Origin: Extensor Digitorum

A

Lateral epicondyle of humerus

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14
Q

Insertion: Extensor Digitorum

A

Extensor expansions of medial 4 digits

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15
Q

Innervation: Extensor Digitorum

A

Deep Branch of radial nerve (C7, C8)

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16
Q

Action: Extensor Digitorum

A

Extends medial four digits primarily at metacarpophalangeal joints, secondarily at interphalangeal joints

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17
Q

Origin: Extensor Digiti Minimi (EDM)

A

Lateral epicondyle of humerus

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18
Q

Insertion: Extensor Digiti Minimi (EDM)

A

Extensor expansion of 5th digit

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19
Q

Innervation: Extensor Digiti Minimi (EDM)

A

Deep Branch of radial nerve (C7, C8)

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20
Q

Action: Extensor Digiti Minimi (EDM)

A

Extends 5th digit primarily at metacarpophalangeal joint, secondarily at interphalangeal joint

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21
Q

Origin: Extensor Carpi Ulnaris (ECU)

A

Lateral epicondyle of humerus; posterior border of ulna via a shared aponeurosis

22
Q

Insertion: Extensor Carpi Ulnaris (ECU)

A

Dorsal aspect of base of 5th metacarpal

23
Q

Innervation: Extensor Carpi Ulnaris (ECU)

A

Deep Branch of radial nerve (C7, C8)

24
Q

Action: Extensor Carpi Ulnaris (ECU)

A

extends and adducts hand at wrist joint (also active during fist clenching)

25
Q

Origin: Supinator

A

lateral epicondyle of humerus; radial collateral and anular ligaments; supinator fossa; crest of ulna

26
Q

Insertion: Supinator

A

lateral, posterior, and anterior surfaces of proximal third of radius

27
Q

Innervation: Supinator

A

Deep Branch of radial nerve (C7, C8)

28
Q

Action: Supinator

A

supinates forearm; rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)

29
Q

Origin: Extensor Indicis

A

Posterior surface of distal third of ulna and interosseous membrane

30
Q

Insertion: Extensor Indicis

A

Extensor expansion of 2nd digit

31
Q

Innervation: Extensor Indicis

A

Posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve

32
Q

Action: Extensor Indicis

A

extends 2nd digit (enabling its independent extension); helps extend hand at wrist

33
Q

Origin: Abductor Pollicis Longus (APL)

A

posterior surface of proximal halves of ulna, radius, and interosseous membrane

34
Q

Insertion: Abductor Pollicis Longus (APL)

A

base of 1st metacarpal

35
Q

Innervation: Abductor Pollicis Longus (APL)

A

posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve

36
Q

Action: Abductor Pollicis Longus (APL)

A

abducts thumb and extends it at carpometacarpal joint

37
Q

Origin: Extensor Pollicis Longus (EPL)

A

posterior surfae of middle third of ulna and interosseous membrane

38
Q

Insertion: Extensor Pollicis Longus (EPL)

A

dorsal aspect of base of distal phalanx of thumb

39
Q

Innervation: Extensor Pollicis Longus (EPL)

A

posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve

40
Q

Action: Extensor Pollicis Longus (EPL)

A

extends distal phalanx of thumb at interphalangeal joint; extends metacarpophalangeal and carpometacarpal joints

41
Q

Origin: Extensor Pollicis Brevis (EPB)

A

posterior surface of distal third of radius and interosseous membrane

42
Q

Insertion: Extensor Pollicis Brevis (EPB)

A

dorsal aspect of base of proximal phalanx of thumb

43
Q

Innervation: Extensor Pollicis Brevis (EPB)

A

posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve

44
Q

Action: Extensor Pollicis Brevis (EPB)

A

extends proximal phalanx of thumb at metacarpophalangeal joint; extends carpometacarpal joint

45
Q

Origin: Triceps Brachii

A

Long Head: infraglenoid tubercle of scapula

Lateral Head: posterior surface of humerus, superior to radial groove

Medial Head: posterior surface of humerus, inferior to radial groove

46
Q

Insertion: Triceps Brachii

A

Proximal end of olecranon of ulna and fascia of forearm

47
Q

Innervation: Triceps Brachii

A

radial nerve (C6, C7, C8)

48
Q

Action: Triceps Brachii

A

Chief extensor of forearm; long head resists dislocation of humerus; especially important during adduction

49
Q

Origin: Anconeus

A

lateral epicondyle of humerus

50
Q

Insertion: Anconeus

A

lateral surface of olecranon and superior part of posterior surface of ulna

51
Q

Innervation: Anconeus

A

Radial nerve (C7, C8, T1)

52
Q

Action: Anconeus

A

assists triceps in extending forearm; stabilizes elbow joint; may abduct ulna during pronation

Anatomy (25 decks)

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