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Upper Limb > Posterior Muscles of Forearm > Flashcards

Posterior Muscles of Forearm Flashcards

1
Q

What muscles extend and abduct or adduct the hand at the wrist joint?

A

Extensor carpi radialis longus, extensor carpi radialis brevis, and extensor carpi ulnaris

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2
Q

What muscles extend the medial four digits?

A

Extensor digitorum, extensor indicis, and extensor digiti minimi

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3
Q

What muscles extend or abduct the thumb?

A

Abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus

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4
Q

What is the origin of the brachioradialis?

A

Proximal two thirds of lateral supraepicondylar ridge of humerus

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5
Q

Where does the brachioradialis insert?

A

Lateral surface of distal end of radius proximal to styloid process

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6
Q

What is the innervation of the brachioradialis?

A

Radial nerve (C5, C6, C7)

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7
Q

What action does the brachioradialis perform?

A

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

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8
Q

What is the origin of the extensor carpi radialis longus?

A

Lateral supra-epicondylar ridge of humerus

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9
Q

Where does the extensor carpi radialis longus insert?

A

Dorsal aspect of base of 2nd metacarpal

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10
Q

What is the innervation of the extensor carpi radialis longus?

A

Radial nerve (C6, C7)

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11
Q

What action does the extensor carpi radialis longus perform?

A

Extend and abduct wrist joint

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12
Q

What is the origin of the extensor carpi radialis brevis?

A

Lateral epicondyle of the humerus

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13
Q

Where does the extensor carpi radialis brevis insert?

A

Dorsal aspect of base of 3rd metacarpal

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14
Q

What is the innervation of the extensor carpi radialis brevis?

A

Deep branch of radial nerve (C7, C8)

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15
Q

What action does the extensor carpi radialis brevis perform?

A

Extend and abduct wrist joint, active during fist clenching

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16
Q

What is the origin of the extensor digitorum?

A

Lateral epicondyle of humerus

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17
Q

Where does the extensor digitorum insert?

A

Extensor expansions of medial four fingers

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18
Q

What is the innervation of the extensor digitorum?

A

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

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19
Q

What action does the extensor digitorum perform?

A

Extends wrist joint and medial four fingers primarily at metacarpophalangeal, secondarily at interphalangeal joints

20
Q

What is the origin of the extensor digiti minimi?

A

Lateral epicondyle of humerus

21
Q

Where does the extensor digiti minimi insert?

A

Extensor expansion of 5th finger

22
Q

What is the innervation of the extensor digiti minimi?

A

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

23
Q

What action does the extensor digiti minimi perform?

A

Extends wrist joint and 5th finger primarily at metacarpophalangeal, secondarily at interphalangeal joint

24
Q

What is the origin of the extensor carpi ulnaris?

A

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

25
Q

Where does the extensor carpi ulnaris insert?

A

Dorsal aspect of base of 5th metacarpal

26
Q

What is the innervation of the extensor carpi ulnaris?

A

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

27
Q

What action does the extensor carpi ulnaris perform?

A

Extends and adducts wrist joint, also active during fist clenching

28
Q

What is the orign of the supinator?

A

Lateral epicondyle of humerus, radial collateral and anular ligaments, supinator fossa, crest of ulna

29
Q

Where does the supinator insert?

A

Lateral, posterior and anterior surfaces of proximal third of radius

30
Q

What is the innervation of the supinator?

A

Deep branch of radial nerve (C7, C8)

31
Q

What action does the supinator perform?

A

Supinates forearm

32
Q

What is the origin of the abdcutor pollicis longs?

A

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

33
Q

Where does the abductor pollicis longus insert?

A

Base of 1st metacarpal

34
Q

What is the innervation of the abductor pollicis longs?

A

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

35
Q

What action does the abductor pollicis longus perform?

A

Extends wrist joint and abducts thumb and extends it at carpometacarpal joint

36
Q

What is the origin of the extensor pollicis longus?

A

Posterior surface of middle third of ulna and interosseous membrane

37
Q

Where does the extensor pollicis longus insert?

A

Dorsal aspect of base of distal phalanx of thumb

38
Q

What is the innervation of the extensor pollicis longus?

A

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

39
Q

What action does the extensor pollicis longus perform?

A

Extends wrist joint and distal phalanx of thumb at interphalangeal joint, also extends metacarpophalngeal and carpometacarpal joints

40
Q

What is the origin of the extensor pollicis brevis?

A

Posterior surface of distal third of radius and interosseous membrane

41
Q

Where does the extensor pollicis brevis insert?

A

Dorsal aspect of base of proximal phalanx of thumb

42
Q

What is the innervation of the extensor pollicis brevis?

A

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

43
Q

What action does the extensor pollicis brevis perform?

A

Extends wrist joint and proximal phalanx of thumb at metacarpophalangeal joint, alsoe extends carpometacarpal joint

44
Q

What is the origin of the extensor indicis?

A

Posterior surface of distal third of ulna and interosseous membrane

45
Q

Where does the extensor indicis insert?

A

Extensor expansion of 2nd finger

46
Q

What is the innervation of the extensor indicis?

A

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

47
Q

What action does the extensor indicis perform?

A

Extends wrist joint and 2nd finger, also helps extend hand at wrist

Upper Limb (18 decks)

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