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Upper Limb > Muscles of Posterior Compartment > Flashcards

Muscles of Posterior Compartment Flashcards

0
Q

Brachioradialis

Insertion

A

Lateral surface of distal end of radius of promixal to styloid process

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1
Q

Brachioradialis

Origin

A

Proximal two thirds of lateral supraepicondylar ridge of humerus

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2
Q

Brachioradialis

Innervation

A

Radial Nerve (C5, C6, C7)

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3
Q

Brachioradialis

Actions

A

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

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4
Q

Extensor Carpi Radialis Longus

Origin

A

Lateral supra-epicondylar ride of humerus

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5
Q

Extensor carpi radialis longus

Insertion

A

Dorsal aspect of base of 2nd metacarpal

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6
Q

Extensor Carpi Radialis Longus

Innervation

A

Radial nerve (C6, C7)

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7
Q

Extensor Carpi Radialis Longus

Actions

A

Extend and abduct wrist joint

Extensor carpi radialis brevis active during fist clenching

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8
Q

Extensor carpi radialis brevis

A

Lateral epicondyle of humerus (common extensor origin)

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9
Q

Extensor carpi radialis brevis

Insertion

A

Dorsal aspect of base of 3rd metacarpal

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10
Q

Extensor carpi radialis brevis

Innervation

A

Deep branch of radial nerve (C7, C8)

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11
Q

Extensor carpi radialis brevis

Actions

A

Extend and abduct wrist joint

Extensor carpi radialis brevis active during fist clenching

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12
Q

Extensor Digitorum

Origin

A

Lateral epicondyle of humerus (common extensor origin)

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13
Q

Extensor Digitorum

Insertion

A

Extensor expansions of medial four fingers

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14
Q

Extensor Digitorum

Innervation

A

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

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15
Q

Extensor Digitorum

Actions

A

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

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16
Q

Extensor Digiti Minimi

Origin

A

Lateral epicondyle of humerus (common extensor origin)

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17
Q

Extensor Digiti Minimi

Insertion

A

Extensor expansion of 5th finger

18
Q

Extensor Digiti Minimi

Innervation

A

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

19
Q

Extensor Digiti Minimi

Actions

A

Extends wrist joint

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

20
Q

Extensor Carpi Ulnaris

Origin

A

Lateral epicondyle of humerus

Posterior border of ulna via a shared aponeurosis

21
Q

Extensor Carpi Ulnaris

Insertion

A

Dorsal aspect of base of 5th metacarpal

22
Q

Extensor Carpi Ulnaris

Innervation

A

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

23
Q

Extensor Carpi Ulnaris

Actions

A

Extends and adducts wrist joint (also active during fist flenching)

24
Q

Supinator

Origin

A

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

25
Q

Supinator

Insertion

A

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

26
Q

Supinator

Innervation

A

Deep branch of radial nerve (C7,C8)

27
Q

Supinator

Actions

A

Supinates forearm

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

28
Q

Abductor pollicis longus

Origin

A

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

29
Q

Abductor pollicis longus

Insertion

A

Base of 1st metacarpal

30
Q

Abductor pollicis longus

Innervation

A

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

31
Q

Abductor pollicis longus

Actions

A

Extends wrist joint

Abducts thumb and extends it at carpometacarpal joint

32
Q

Extensor pollicis longus

Origin

A

Posterior surface of middle third of ulna and interosseous membrane

33
Q

Extensor pollicis longus

Insertion

A

Dorsal aspect of base of distal phalanx of thumb

34
Q

Extensor pollicis longus

Innervation

A

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

35
Q

Extensor pollicis longus

Actions

A

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

36
Q

Extensor pollicis brevis

Origin

A

Posterior surface of distal third of radius and interosseous membrane

37
Q

Extensor pollicis brevis

Insertion

A

Dorsal aspect of base of proximal phalanx of thumb

38
Q

Extensor pollicis brevis

Innervation

A

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

39
Q

Extensor pollicis brevis

Actions

A

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

40
Q

Extensor Indicis

Origin

A

Posterior surface of distal third of ulna and interosseous membrane

41
Q

Extensor indicis

Insertion

A

Extensor expansion of 2nd finger

42
Q

Extensor Indicis

Innervation

A

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

43
Q

Extensor Indicis

Actions

A

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

Upper Limb (10 decks)

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