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Gross Anatomy - Unit 2 > Posterior Forearm Muscles > Flashcards

Posterior Forearm Muscles Flashcards

0
Q

Insertion of brachioradialis

A

Lateral surface of distal end of radius proximal to styloid process

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1
Q

Origin of brachioradialis

A

Proximal two thirds of lateral supra-epicondylar ridge of humerus

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2
Q

Innervation of brachioradialis

A

Radial nerve (C5, C6, C7)

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3
Q

Action of brachioradialis

A

Relatively weak flexion of elbow joint, maximal when forearm is in midpronated position

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4
Q

Origin of extensor carpi radialis longus

A

Lateral supra-epicondylar ridge of humerus

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5
Q

Insertion of extensor carpi radialis longus

A

Dorsal aspect of base of 2nd metacarpal

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6
Q

Innervation of extensor carpi radialis longus

A

Radial nerve (C6, C7)

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7
Q

Action of extensor carpi radialis longus

A

Extend and abduct wrist joint

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8
Q

Origin of extensor carpi radialis brevis

A

Lateral epicondyle of humerus

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9
Q

Insertion of extensor carpi radialis brevis

A

Dorsal aspect of base of 3rd metacarpal

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10
Q

Innervation of extensor carpi radialis brevis

A

Deep branch of radial nerve (C7, C8)

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11
Q

Action of extensor carpi radialis brevis

A

Extend and abduct wrist joint

Active during first clenching

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12
Q

Origin of extensor digitorum

A

Lateral epicondyle of humerus

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13
Q

Insertion of extensor digitorum

A

Extensor expansions of medial four fingers

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14
Q

Innervation of extensor digitorum

A

Deep branch of radial nerve (C7, C8)

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15
Q

Action of extensor digitorum

A

Extend wrist joint
Extend medial four fingers primarily at metacarpophalangeal joints
Secondarily at interphalangeal joints

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16
Q

Origin of extensor digiti minimi

A

Lateral epicondyle of humerus

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17
Q

Insertion of extensor digiti minimi

A

Extensor expansion of 5th finger

18
Q

Innervation of extensor digiti minimi

A

Posterior interosseous nerve (C7, C8)

19
Q

Action of extensor digiti minimi

A

Extends wrist joint
Extends 5th finger primarily at metacarpophalangeal joint
Secondarily at interphalangeal joint

20
Q

Origin of extensor carpi ulnaris

A

Lateral epicondyle of humerus

Posterior border of ulna via a shared aponeurosis

21
Q

Insertion of extensor carpi ulnaris

A

Dorsal aspect of base of 5th metacarpal

22
Q

Innervation of extensor carpi ulnaris

A

Posterior interosseous nerve (C7, C8)

23
Q

Action of extensor carpi ulnaris

A

Extends and adducts wrist joint

Also active during fist clenching

24
Q

Origin of supinator

A

Lateral epicondyle of humerus
Radial collateral and anular ligaments
Supinator fossa
Crest of ulna

25
Q

Insertion of supinator

A

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

26
Q

Innervation of supinator

A

Deep branch of radial nerve (C7, C8)

27
Q

Action of supinator

A

Supinates forearm

Rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)

28
Q

Origin of abductor pollicis longus

A

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

29
Q

Insertion of abductor pollicis longus

A

Base of 1st metacarpal

30
Q

Innervation of abductor pollicis longus

A

Posterior interosseous nerve (C7, C8)

Continuation of deep branch of radial nerve

31
Q

Action of abductor pollicis longus

A

Extends wrist joint

Abducts thumb and extends it at carpometacarpal joint

32
Q

Origin of extensor pollicis longus

A

Posterior surface of middle third of ulna and interosseous membrane

33
Q

Insertion of extensor pollicis longus

A

Dorsal aspect of base of distal phalanx of thumb

34
Q

Innervation of extensor pollicis longus

A

Posterior interosseous nerve (C7, C8)

Continuation of deep branch of radial nerve

35
Q

Action of extensor pollicis longus

A

Extends wrist joint
Extends distal phalanx of thumb at interphalangeal joint
Extends metacarpophalangeal joint
Extends carpometacarpal joint

36
Q

Origin of extensor pollicis brevis

A

Posterior surface of distal third of radius and interosseous membrane

37
Q

Insertion of extensor pollicis brevis

A

Dorsal aspect of base of proximal phalanx of thumb

38
Q

Innervation of extensor pollicis brevis

A

Posterior interosseous nerve (C7, C8)

Continuation of deep branch of radial nerve

39
Q

Action of extensor pollicis brevis

A

Extends wrist joint
Extends proximal phalanx of thumb at metacarpophalangeal joint
Extends carpometacarpal joint

40
Q

Origin of extensor indicis

A

Posterior surface of distal third of ulna and interosseous membrane

41
Q

Insertion of extensor indicis

A

Extensor expansion of 2nd finger

42
Q

Innervation of extensor indicis

A

Posterior interosseous nerve (C7, C8)

Continuation of deep branch of radial nerve

43
Q

Action of extensor indicis

A

Extends wrist joint
Extends 2nd finger (enabling its independent extension)
Helps extend hand at wrist

Gross Anatomy - Unit 2 (11 decks)

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